Automatically add DIY docs label to applicable PRs (#54771)

Co-authored-by: Kevin Heis <heiskr@users.noreply.github.com>

Author: jc-clark

.github/workflows/first-responder-v2-prs-collect.yml

@@ -65,6 +65,29 @@ jobs:
         run: |
           gh pr edit $PR_URL --add-label docs-content-fr
 
+      # Check if the PR is connected to an issue that has the DIY docs label. If yes, then add the DIY docs label to the PR.
+      - name: Check if PR is connected to DIY docs issue
+        id: check-diy-docs
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          ISSUE_NUMS=$(echo "${{ github.event.pull_request.body }}" | grep -oE '#[0-9]+' | tr -d '#')
+          for ISSUE_NUM in $ISSUE_NUMS; do
+            LABELS=$(gh issue view $ISSUE_NUM --json labels --jq '.labels[].name')
+            if echo "$LABELS" | grep -q 'DIY docs'; then
+              echo "DIY_DOCS_LABEL=true" >> $GITHUB_ENV
+              break
+            fi
+          done
+
+      - name: Add the DIY docs label if connected to a DIY docs issue
+        if: ${{ env.DIY_DOCS_LABEL == 'true' }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          PR_URL: ${{ github.event.pull_request.html_url }}
+        run: |
+          gh pr edit $PR_URL --add-label 'DIY docs'
+
       # Add to the FR project
       # and set type to "Maintenance" or "External contributor PR"
       # and set date to now