Add PHPCBF to lint workflow

.github/workflows/lint.yml

@@ -1,6 +1,46 @@
 name: Lint
-on: push
+on: [pull_request]
+permissions:
+  contents: write
+  pull-requests: write
 jobs:
+    phpcbf:
+      name: PHPCBF & Commit
+      runs-on: ubuntu-latest
+      steps:
+        - name: Checkout
+          uses: actions/checkout@v4
+          with:
+            ref: ${{ github.event.pull_request.head.ref }}
+        - name: PHPCBF
+          run: |
+            composer install
+            if ! composer phpcbf; then
+              echo "cbf=true" >> $GITHUB_ENV
+            else
+              echo "cbf=false" >> $GITHUB_ENV
+            fi
+        - name: Commit changes to PR
+          if: env.cbf == 'true'
+          run: |
+            git config --global user.email "[email protected]"
+            git config --global user.name "Pantheon Robot"
+            if ! git diff-index --quiet HEAD --; then
+              CHANGES_DETECTED=true
+              git add *.php
+              git commit -m "PHPCBF: Fix coding standards" --no-verify
+              git push origin ${{ github.event.pull_request.head.ref }} || CHANGES_DETECTED=false
+              echo "changes_detected=$CHANGES_DETECTED" >> $GITHUB_ENV
+            else
+              echo "changes_detected=false" >> $GITHUB_ENV
+            fi
+        - name: Add PR Comment
+          if: changes_detected == 'true'
+          env:
+            GH_TOKEN: ${{ github.token }}
+          run: |
+            CURRENT_COMMIT=$(git rev-parse --short HEAD)
+            gh pr comment ${{ github.event.pull_request.number }} -b "Hi from your friendly Pantheon Robot! :robot: I fixed PHPCS issues with \`phpcbf\` on $CURRENT_COMMIT. Please review the changes."
     lint:
         name: Lint
         runs-on: ubuntu-latest