Update the subtree.yml workflow file to create a PR and merge

Author: sfeifer

.github/workflows/subtree.yml

@@ -15,10 +15,40 @@ jobs:
         with:
           ref: main
           fetch-depth: 0
-      - name: subtree merge
+      - name: subtree merge and create PR
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
           set -euxo pipefail
           git config --global user.name "github-actions[bot]"
           git config --global user.email "41898282+github-actions[bot]@users.noreply.github.com"
+          
+          BRANCH_NAME="sync-ansible-pcp-subtree-$(date +%Y%m%d-%H%M%S)"
+          git checkout -b "$BRANCH_NAME"
+
+          BEFORE_COMMIT=$(git rev-parse HEAD)
+          
           git subtree pull --prefix vendor/github.com/performancecopilot/ansible-pcp https://github.com/performancecopilot/ansible-pcp.git HEAD --squash
-          git push
+
+          if git diff --quiet "$BEFORE_COMMIT" HEAD; then
+            echo "No changes detected, skipping PR creation"
+            git checkout main
+            git branch -D "$BRANCH_NAME"
+            exit 0
+          fi
+          
+          git push origin "$BRANCH_NAME"
+
+          PR_URL=$(gh pr create \
+            --title "Sync ansible-pcp git subtree" \
+            --body "Automated sync of ansible-pcp git subtree from upstream repository. This PR contains the latest changes from https://github.com/performancecopilot/ansible-pcp.git" \
+            --base main \
+            --head "$BRANCH_NAME")
+          
+          echo "Created PR: $PR_URL"
+          
+          # Wait for PR to be fully created
+          sleep 10
+
+          gh pr merge "$PR_URL" --squash --delete-branch
+          echo "PR merged and branch deleted"