pa11y ci

.github/workflows/pa11y.yml

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+name: '♿ Pa11y'
+on: pull_request
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
+      - uses: actions/setup-node@v3
+        with:
+          node-version: 20
+      - name: npm install, build
+        run: |
+          npm install
+          npm run build
+
+      - name: Run pa11y-ci.
+        run: npm run pa11y-ci:sitemap 2>&1 | tee pa11y_output.txt
+
+      - name: Read pa11y_output file.
+        id: pa11y_output
+        uses: juliangruber/read-file-action@v1
+        with:
+          path: ./pa11y_output.txt
+
+      - name: Comment on pull request.
+        uses: thollander/actions-comment-pull-request@master
+        with:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          message: '<details><summary>Pa11y testing results</summary>```${{ steps.pa11y_output.outputs.content }}```</details>'
+
+      - name: Check for pa11y failures.
+        if: contains(steps.pa11y_output.outputs.content, 'errno 2')
+        run: |
+          echo "::error::The site is failing accessibility tests. Please review the comment in the pull request or the pa11y-ci step in the workflow for details."
+          exit 1