CI: Add a sanity job to check the docs XML, and run the sanity

workflow for all changes to docs/.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
GitHub: closes #763


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1938305 13f79535-47bb-0310-9956-ffa450edef68

.github/workflows/sanity.yml

@@ -8,8 +8,6 @@ on:
   push:
     branches: [ "*" ]
     paths-ignore:
-      - 'docs/**'
-      - '!docs/log-message-tags/**'
       - STATUS
       - CHANGES
       - README*
@@ -18,8 +16,6 @@ on:
   pull_request:
     branches: [ "trunk", "2.4.x" ]
     paths-ignore:
-      - 'docs/**'
-      - '!docs/log-message-tags/**'
       - STATUS
       - CHANGES
       - README*
@@ -54,3 +50,14 @@ jobs:
            sudo apt-get install -o Acquire::Retries=5 libapr1-dev libaprutil1-dev
     - name: Check for autoconf warnings
       run: ./buildconf --with-apr=/usr/bin/apr-1-config --with-errors
+
+  docs:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+    - uses: actions/checkout@v6
+    - name: Install prerequisites
+      run: sudo apt-get -o Acquire::Retries=5 update &&
+           sudo apt-get install -o Acquire::Retries=5 libxml2-utils w3c-sgml-lib
+    - name: Check docs XML
+      run: ./test/gha-docs-check.sh