chore: T8937: retire Mergify-replaceable GHA caller workflows

Replaces 5 caller workflows now superseded by central Mergify rules.
See https://vyos.dev/T8937 for the design + spec + plan.

Advances: T8937

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

4 files changed, 0 insertions, 63 deletions

diff --git a/.github/workflows/add-pr-labels.yml b/.github/workflows/add-pr-labels.yml
deleted file mode 100644
index d9e307dd..00000000
--- a/.github/workflows/add-pr-labels.yml
+++ /dev/null
@@ -1,18 +0,0 @@
----
-name: Add pull request labels
-
-on:
-  pull_request_target:
-    branches:
-      - current
-      - circinus
-      - sagitta
-
-permissions:
-  pull-requests: write
-  contents: read
-
-jobs:
-  add-pr-label:
-    uses: vyos/.github/.github/workflows/add-pr-labels.yml@current
-    secrets: inherit
diff --git a/.github/workflows/auto-author-assign.yml b/.github/workflows/auto-author-assign.yml
deleted file mode 100644
index 61612cce..00000000
--- a/.github/workflows/auto-author-assign.yml
+++ /dev/null
@@ -1,14 +0,0 @@
-name: "PR Triage"
-on:
-  pull_request_target:
-    types: [opened, reopened, ready_for_review, locked]
-
-
-permissions:
-  pull-requests: write
-  contents: read
-
-jobs:
-  assign-author:
-    uses: vyos/.github/.github/workflows/assign-author.yml@current
-    secrets: inherit
diff --git a/.github/workflows/check-pr-message.yml b/.github/workflows/check-pr-message.yml
deleted file mode 100644
index e03a9ec0..00000000
--- a/.github/workflows/check-pr-message.yml
+++ /dev/null
@@ -1,19 +0,0 @@
----
-name: Check pull request message format
-
-on:
-  pull_request_target:
-    branches:
-      - current
-      - circinus
-      - sagitta
-    types: [opened, synchronize, edited]
-
-permissions:
-  pull-requests: write
-  contents: read
-
-jobs:
-  check-pr-title:
-    uses: vyos/.github/.github/workflows/check-pr-message.yml@current
-    secrets: inherit
diff --git a/.github/workflows/label-backport.yml b/.github/workflows/label-backport.yml
deleted file mode 100644
index efbd4388..00000000
--- a/.github/workflows/label-backport.yml
+++ /dev/null
@@ -1,12 +0,0 @@
-name: Mergifyio backport
-
-on: [issue_comment]
-
-permissions:
-  pull-requests: write
-  contents: read
-
-jobs:
-  mergifyio-backport:
-    uses: vyos/.github/.github/workflows/label-backport.yml@current
-    secrets: inherit