Add workflow to check README changes are done via tags.yaml

.github/workflows/check-readme-changes.yml

@@ -0,0 +1,132 @@
+name: Check README Changes
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+jobs:
+  check-readme-changes:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+      contents: read
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Check if README files were modified without tags.yaml
+        id: check
+        run: |
+          # Get the base and head commits
+          BASE_SHA="${{ github.event.pull_request.base.sha }}"
+          HEAD_SHA="${{ github.event.pull_request.head.sha }}"
+
+          # Get list of changed files
+          changed_files=$(git diff --name-only --diff-filter=ACMR "$BASE_SHA" "$HEAD_SHA" || echo "")
+
+          readme_changed=false
+          tags_yaml_changed=false
+          readme_files=""
+
+          # Check each changed file
+          if [ -n "$changed_files" ]; then
+            while IFS= read -r file || [ -n "$file" ]; do
+              # Check if it's a TAG README file (tags/*/README.md)
+              if echo "$file" | grep -qE "^tags/[^/]+/README\.md$"; then
+                readme_changed=true
+                if [ -z "$readme_files" ]; then
+                  readme_files="$file"
+                else
+                  readme_files="$readme_files"$'\n'"$file"
+                fi
+              fi
+              # Check if it's a TOC subproject README file (toc_subprojects/*/README.md)
+              if echo "$file" | grep -qE "^toc_subprojects/[^/]+/README\.md$"; then
+                readme_changed=true
+                if [ -z "$readme_files" ]; then
+                  readme_files="$file"
+                else
+                  readme_files="$readme_files"$'\n'"$file"
+                fi
+              fi
+              # Check if tags.yaml was changed
+              if [ "$file" = "tags.yaml" ]; then
+                tags_yaml_changed=true
+              fi
+            done <<< "$changed_files"
+          fi
+
+          echo "readme_changed=$readme_changed" >> $GITHUB_OUTPUT
+          echo "tags_yaml_changed=$tags_yaml_changed" >> $GITHUB_OUTPUT
+
+          if [ "$readme_changed" = "true" ] && [ "$tags_yaml_changed" = "false" ]; then
+            echo "should_comment=true" >> $GITHUB_OUTPUT
+            # Format README files as markdown list
+            if [ -n "$readme_files" ]; then
+              formatted_list=$(echo "$readme_files" | while IFS= read -r file || [ -n "$file" ]; do
+                echo "- \`$file\`"
+              done)
+              {
+                echo "files_list<<EOF"
+                echo "$formatted_list"
+                echo "EOF"
+              } >> $GITHUB_OUTPUT
+            else
+              echo "files_list=" >> $GITHUB_OUTPUT
+            fi
+          else
+            echo "should_comment=false" >> $GITHUB_OUTPUT
+            echo "files_list=" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Comment on PR
+        if: steps.check.outputs.should_comment == 'true'
+        uses: actions/github-script@v7
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const comment = `## ⚠️ README Files Should Be Updated via tags.yaml
+
+            The following TAG or TOC subproject README files have been directly edited:
+
+            ${{ steps.check.outputs.files_list }}
+
+            These README files are auto-generated from the \`tags.yaml\` file using the generator script. **Please update the \`tags.yaml\` file instead** of editing the README files directly.
+
+            For more information on how to update these files, please see the [generator README](https://github.com/${{ github.repository }}/blob/main/generator/README.md).
+
+            Once you update \`tags.yaml\`, the README files will be automatically regenerated by the existing automation workflow.`;
+
+            // Check if we've already commented on this PR
+            const comments = await github.rest.issues.listComments({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number,
+            });
+
+            const botComment = comments.data.find(comment => 
+              comment.user.type === 'Bot' && 
+              comment.body.includes('README Files Should Be Updated via tags.yaml')
+            );
+
+            if (botComment) {
+              // Update existing comment
+              await github.rest.issues.updateComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                comment_id: botComment.id,
+                body: comment
+              });
+            } else {
+              // Create new comment
+              await github.rest.issues.createComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: context.issue.number,
+                body: comment
+              });
+            }
+