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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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* 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).

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* 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.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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* 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).

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

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1 files changed, 69 insertions, 0 deletions

diff --git a/docs/_static/js/pagefind-wrapper.js b/docs/_static/js/pagefind-wrapper.js
new file mode 100644
index 00000000..a4acadf8
--- /dev/null
+++ b/docs/_static/js/pagefind-wrapper.js
@@ -0,0 +1,69 @@
+/* Version-scoped Pagefind loader. Derives its base from the current URL so the
+ * same file works on production, canary, and /pr-<n>/ previews (§9). */
+(function (window) {
+  'use strict';
+
+  function basePathFor(pathname) {
+    var m = pathname.match(/^((\/pr-\d+)?\/[a-z]{2}(?:_[A-Z]{2})?\/[^/]+\/)/);
+    if (!m) return null;
+    return { base: m[1], prefix: m[2] || '' };
+  }
+
+  function prefixResultUrl(url, prefix) {
+    return prefix ? prefix + url : url;
+  }
+
+  function assetUrlsFor(base) {
+    return {
+      css: base + 'pagefind/pagefind-ui.css',
+      js: base + 'pagefind/pagefind-ui.js',
+    };
+  }
+
+  function init() {
+    var mount = document.getElementById('vyos-search');
+    if (!mount) return;
+    var ctx = basePathFor(window.location.pathname);
+    if (!ctx) return;
+    var assets = assetUrlsFor(ctx.base);
+    /* Stylesheet first so the UI never renders unstyled. CSS load failure is
+     * cosmetic only — no error handler on the link. */
+    var l = document.createElement('link');
+    l.rel = 'stylesheet';
+    l.href = assets.css;
+    document.head.appendChild(l);
+    var s = document.createElement('script');
+    s.src = assets.js;
+    s.onerror = function () {
+      /* Per-version Pagefind assets missing (index not built yet, preview
+       * namespace, transient failure) — show a visible notice instead of
+       * leaving #vyos-search a silent empty div. */
+      var p = document.createElement('p');
+      p.className = 'vyos-search-unavailable';
+      p.textContent = 'Search is temporarily unavailable for this version.';
+      mount.appendChild(p);
+    };
+    s.onload = function () {
+      /* global PagefindUI */
+      new window.PagefindUI({
+        element: '#vyos-search',
+        baseUrl: ctx.base,
+        bundlePath: ctx.base + 'pagefind/',
+        processResult: function (result) {
+          result.url = prefixResultUrl(result.url, ctx.prefix);
+          return result;
+        },
+      });
+    };
+    document.head.appendChild(s);
+  }
+
+  window.VyOSSearch = {
+    basePathFor: basePathFor,
+    prefixResultUrl: prefixResultUrl,
+    assetUrlsFor: assetUrlsFor,
+    init: init,
+  };
+  if (typeof document !== 'undefined' && document.addEventListener)
+    document.addEventListener('DOMContentLoaded', init);
+})(window);