docs: Cloudflare Workers hosting pipeline (apex, content workers, CI, previews) (#2140)

* docs-infra: scaffold Cloudflare workers workspace (versions.json v2, matrix, toolchain)

🤖 Generated by [robots](https://vyos.io)

* docs-infra: record full Phase-0 plan decision in workers/PLAN.md

🤖 Generated by [robots](https://vyos.io)

* docs-infra: shared content worker — asset serving, cache classes, X-Docs-Build, canary no-store

🤖 Generated by [robots](https://vyos.io)

* docs-infra: run worker script before assets; test fetch entrypoint

🤖 Generated by [robots](https://vyos.io)

* docs-infra: apex manifest loader + dispatch map + runtime binding guard (TDD)

🤖 Generated by [robots](https://vyos.io)

* docs-infra: apex redirects (aliases, PDF, trailing-slash) + special paths (TDD)

🤖 Generated by [robots](https://vyos.io)

* docs-infra: PDF redirect honors pdf:null and preserves query

🤖 Generated by [robots](https://vyos.io)

* docs-infra: apex UA gate — allowlist-wins, log-only AI crawlers, empty block list at launch

🤖 Generated by [robots](https://vyos.io)

* docs-infra: apex router (pipeline §3.2), themed 404/503, /kb seam, env configs + congruence test

🤖 Generated by [robots](https://vyos.io)

* docs-infra: add missing-User-Agent regression test for apex UA gate

🤖 Generated by [robots](https://vyos.io)

* docs-infra: R2-streaming preview worker — MIME map, noindex, no-store (TDD)

🤖 Generated by [robots](https://vyos.io)

* docs-infra: preview 404 no-store + fetch handler tests

🤖 Generated by [robots](https://vyos.io)

* docs-infra: bootstrap script — binding-target workers must exist before apex deploys

🤖 Generated by [robots](https://vyos.io)

* docs-infra: apex run_worker_first, lockfile for npm ci, PDF Location from manifest

🤖 Generated by [robots](https://vyos.io)

* docs-infra: derive html_baseurl from DOCS_VERSION_SLUG with RTD fallback (canonical gate prereq)

🤖 Generated by [robots](https://vyos.io)

* docs-infra: version picker + status banner + language scaffold (vanilla JS, TDD pure core)

🤖 Generated by [robots](https://vyos.io)

* docs-infra: picker preserves query+hash across switch; valid breadcrumb markup

🤖 Generated by [robots](https://vyos.io)

* docs-infra: Pagefind search wrapper with runtime base-path + preview prefix handling (TDD)

🤖 Generated by [robots](https://vyos.io)

* docs-infra: pagefind wrapper — asset-failure notice + UI stylesheet load

🤖 Generated by [robots](https://vyos.io)

* docs-infra: gate Pagefind searchbox to CF builds (RTD keeps stock search until cutover)

🤖 Generated by [robots](https://vyos.io)

* docs-infra: deploy sanity gates — limits, critical pages, count-delta, canonical (TDD)

🤖 Generated by [robots](https://vyos.io)

* docs-infra: hermetic gate tests via fixture versions.json

🤖 Generated by [robots](https://vyos.io)

* docs-infra: docs-build workflow — candidate/smoke/promote two-stage deploy + registry + rollback

Two-stage CF Workers pipeline: build in pinned container, assemble artifact,
sanity gates, deploy candidate, scoped pre-traffic smoke via canary apex,
promote (rollback-id capture, hostname purge, registry upload), post-promote
probe + auto-rollback. DOCS_CF_LIVE repo variable gates every docs.vyos.io
production interaction pre-cutover.

scripts/docs_gates/smoke.py adds one authorized check beyond the spec: the
version's index.html probe asserts the #vyos-search mount div is present in
the response body, guarding CI silently forgetting DOCS_VERSION_SLUG (which
would otherwise ship stock RTD search without the Pagefind gate noticing).

🤖 Generated by [robots](https://vyos.io)

* docs-infra: build docs image in-workflow with buildx cache (v4.1 — digest pin dropped)

Plan v4.1 amendment: the ghcr.io digest-pinned image does not exist (workflow
would hard-fail at the first docker step on every push). Replace the BUILD_IMAGE
env placeholder with an in-workflow docker build from docker/Dockerfile via
docker/setup-buildx-action@v3 + docker/build-push-action@v6 (context: docker/,
load: true, tags: docs-build:local, GHA cache from/to). The checked-out commit
is the pin; buildx GHA cache keeps repeat builds cheap. Sphinx-build step swaps
to docs-build:local; inner script unchanged.

🤖 Generated by [robots](https://vyos.io)

* docs-infra: apex/preview deploy workflow — canary auto, production behind environment approval

* docs-infra: apex-deploy concurrency guard (per-ref, cancel-in-progress)

🤖 Generated by [robots](https://vyos.io)

* docs-infra: fork-safe PR preview pipeline — approval record, R2 prefixes, label consumption, cleanup

* docs-infra: nightly preview sweep — pipefail + per-prefix failure isolation

🤖 Generated by [robots](https://vyos.io)

* docs-infra: nightly canary QA — per-entry sweep + URL-parity corpus vs RTD

🤖 Generated by [robots](https://vyos.io)

* docs-infra: parity sweep scoped to CF-built versions; transport-error resilience

🤖 Generated by [robots](https://vyos.io)

* docs-infra: one-off bootstrap workflow (binding targets — runs once on this push)

🤖 Generated by [robots](https://vyos.io)

* docs-infra: remove one-off bootstrap workflow (bootstrap complete)

🤖 Generated by [robots](https://vyos.io)

* docs-infra: one-off canary apex + preview deploy (route targets for Task 3.6 step 2c)

🤖 Generated by [robots](https://vyos.io)

* docs-infra: remove one-off canary deploy workflow (targets live)

🤖 Generated by [robots](https://vyos.io)

* docs-infra: address Phase-0 CodeRabbit findings (canonical gate, error caching, registry pointer, validation)

🤖 Generated by [robots](https://vyos.io)

* docs-infra: strengthen manifest tests (full dispatch iteration, mutation-free validate)

🤖 Generated by [robots](https://vyos.io)

* docs-infra: address GitHub CodeRabbit review (pointer-after-probe, fail-closed sweeps, block-precedence UA gate, preview hardening)

🤖 Generated by [robots](https://vyos.io)

* docs-infra: adversarial review fixes — error no-store, probe retry, PR-list membership, preview dotted-segment

🤖 Generated by [robots](https://vyos.io)

* docs-infra: serve oversized legacy PDF from R2 via apex (spec §5 fallback)

The 1.3 PDF (29.2 MiB) exceeds the 25 MiB static-asset cap and is absent
from the legacy content Worker's build, so /_/downloads/en/1.3/pdf/ (and
the picker's PDF link) 301'd into a dead-end 404 post-cutover. Add the R2
object fallback spec §5 already documented but never implemented: a
DOCS_PDFS R2 bucket binding on the apex Worker, a manifest pdf_r2_key
field (1.3 only), and a router step ahead of version dispatch that streams
the object with its own cache class (canary/error still force no-store).

🤖 Generated by [robots](https://vyos.io)

* docs-infra: PDF R2 fallback honors Range + If-None-Match, preserves ETag

🤖 Generated by [robots](https://vyos.io)

1 files changed, 117 insertions, 0 deletions

diff --git a/scripts/docs_gates/smoke.py b/scripts/docs_gates/smoke.py
new file mode 100644
index 00000000..d25e9a1f
--- /dev/null
+++ b/scripts/docs_gates/smoke.py
@@ -0,0 +1,117 @@
+"""Scoped pre-traffic smoke + post-promote probe (spec §7.1 steps 2/5).
+
+Probes ONE version's pages plus apex special paths through a host, presenting a
+CF Access service token. Header contract (§3.3): content probes assert
+X-Docs-Build == --expect-sha; apex probes assert X-Apex-Build presence only.
+
+Phase-2 obligation (authorized addition, not in the original spec text): the
+version's index.html probe also asserts the response body carries the
+`#vyos-search` mount div (docs/_templates/searchbox.html), guarding the
+Pagefind gate's silent-degrade failure mode — a build that forgot to set
+DOCS_VERSION_SLUG would otherwise ship stock RTD search without CI noticing.
+"""
+from __future__ import annotations
+
+import argparse
+import dataclasses
+import json
+import sys
+import urllib.request
+
+APEX_PATHS = ["/versions.json", "/healthz", "/robots.txt", "/sitemap.xml"]
+SEARCH_MOUNT_MARKER = 'id="vyos-search"'
+
+
+class _NoRedirect(urllib.request.HTTPRedirectHandler):
+    """Probes assert an EXACT status per-path (200 or 404) — following a 3xx would
+    silently swap the probed status for whatever the redirect target returns,
+    masking an accidental redirect where a direct 200/404 was expected. Mirrors
+    parity.py's _NoRedirect/_OPENER pattern."""
+
+    def redirect_request(self, req, fp, code, msg, headers, newurl):  # noqa: D401
+        return None
+
+
+_OPENER = urllib.request.build_opener(_NoRedirect)
+
+
+@dataclasses.dataclass
+class Probe:
+    path: str
+    expect_status: int
+    assert_docs_build: bool
+    assert_apex_build: bool
+    assert_search_mount: bool = False
+
+
+def probe_plan(slug: str, pdf: str | None, critical: list[str]) -> list[Probe]:
+    plan = [Probe(f"/en/{slug}/{rel}", 200, True, False) for rel in ["index.html", *critical]]
+    plan.append(Probe(f"/en/{slug}/pagefind/pagefind.js", 200, True, False))
+    if pdf:
+        plan.append(Probe(pdf, 200, True, False))
+    plan.append(Probe(f"/en/{slug}/definitely-missing-page-xyz.html", 404, False, False))
+    plan += [Probe(p, 200, False, True) for p in APEX_PATHS]
+    plan[0].assert_search_mount = True  # plan[0] is always /en/<slug>/index.html
+    return plan
+
+
+def docs_build_ok(header_value: str | None, expect_sha: str) -> bool:
+    """SKIP sentinel (nightly sweep): header presence only; otherwise exact match."""
+    if expect_sha == "SKIP":
+        return header_value is not None
+    return header_value == expect_sha
+
+
+def search_mount_present(html: str) -> bool:
+    return SEARCH_MOUNT_MARKER in html
+
+
+def run(host: str, slug: str, expect_sha: str, access_id: str, access_secret: str,
+        pdf: str | None, critical: list[str]) -> int:
+    failures = 0
+    for probe in probe_plan(slug, pdf, critical):
+        req = urllib.request.Request(f"https://{host}{probe.path}", method="GET")
+        req.add_header("CF-Access-Client-Id", access_id)
+        req.add_header("CF-Access-Client-Secret", access_secret)
+        try:
+            with _OPENER.open(req, timeout=30) as resp:
+                status, headers, body = resp.status, resp.headers, resp.read()
+        except urllib.error.HTTPError as e:  # non-2xx still carries headers
+            status, headers, body = e.code, e.headers, e.read()
+        except Exception as e:  # noqa: BLE001 — any transport error fails the probe
+            print(f"SMOKE-FAIL {probe.path}: {e}", file=sys.stderr)
+            failures += 1
+            continue
+        ok = status == probe.expect_status
+        if probe.assert_docs_build and not docs_build_ok(headers.get("X-Docs-Build"), expect_sha):
+            ok = False
+        if probe.assert_apex_build and not headers.get("X-Apex-Build"):
+            ok = False
+        if probe.assert_search_mount and not search_mount_present(
+                body.decode("utf-8", errors="replace")):
+            ok = False
+        if not ok:
+            print(f"SMOKE-FAIL {probe.path}: status={status} "
+                  f"docs-build={headers.get('X-Docs-Build')}", file=sys.stderr)
+            failures += 1
+    print(json.dumps({"failures": failures}))
+    return 1 if failures else 0
+
+
+def main() -> int:
+    ap = argparse.ArgumentParser()
+    ap.add_argument("--host", required=True)
+    ap.add_argument("--slug", required=True)
+    ap.add_argument("--expect-sha", required=True)
+    ap.add_argument("--access-id", required=True)
+    ap.add_argument("--access-secret", required=True)
+    ap.add_argument("--pdf", default=None)
+    ap.add_argument("--critical-list", default="scripts/docs_gates/critical-pages.txt")
+    a = ap.parse_args()
+    critical = [line.strip() for line in open(a.critical_list).read().splitlines()
+                if line.strip() and not line.startswith("#")]
+    return run(a.host, a.slug, a.expect_sha, a.access_id, a.access_secret, a.pdf, critical)
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())