[3.14] gh-141004: GHA: Run check-c-api-docs check on docs-only PRs (GH-143573) (#154464)

(cherry picked from commit e5b5a15)

Author: StanFromIreland

.github/workflows/build.yml

@@ -187,9 +187,14 @@ jobs:
       - name: Check for unsupported C global variables
         if: github.event_name == 'pull_request'  # $GITHUB_EVENT_NAME
         run: make check-c-globals
-      - name: Check for undocumented C APIs
-        run: make check-c-api-docs
 
+  check-c-api-docs:
+    name: C API Docs
+    needs: build-context
+    if: >-
+      needs.build-context.outputs.run-tests == 'true'
+      || needs.build-context.outputs.run-docs == 'true'
+    uses: ./.github/workflows/reusable-check-c-api-docs.yml
 
   build-windows:
     name: >-
@@ -674,6 +679,7 @@ jobs:
     - check-docs
     - check-autoconf-regen
     - check-generated-files
+    - check-c-api-docs
     - build-windows
     - build-windows-msi
     - build-macos
@@ -710,6 +716,12 @@ jobs:
             '
             || ''
           }}
+          ${{
+            !fromJSON(needs.build-context.outputs.run-tests)
+            && !fromJSON(needs.build-context.outputs.run-docs)
+            && 'check-c-api-docs,'
+            || ''
+          }}
           ${{ !fromJSON(needs.build-context.outputs.run-windows-tests) && 'build-windows,' || '' }}
           ${{
             !fromJSON(needs.build-context.outputs.run-ci-fuzz)

.github/workflows/reusable-check-c-api-docs.yml

@@ -0,0 +1,25 @@
+name: Reusable C API Docs Check
+
+on:
+  workflow_call:
+
+permissions:
+  contents: read
+
+env:
+  FORCE_COLOR: 1
+
+jobs:
+  check-c-api-docs:
+    name: 'Check if all C APIs are documented'
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
+        with:
+          python-version: '3.x'
+      - name: Check for undocumented C APIs
+        run: python Tools/check-c-api-docs/main.py