check before create (#120)

Author: RoryQ

.github/workflows/check-emulator-version.yaml

@@ -159,25 +159,49 @@ jobs:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           script: |
             const nextVersion = process.env.NEXT_VERSION;
+            const issueTitle = `Emulator version update verification failed: ${nextVersion}`;
+
+            console.log(`Checking for existing issues for version: ${nextVersion}`);
+
+            // Search for existing open issues with the same title
+            const existingIssues = await github.rest.search.issuesAndPullRequests({
+              q: `repo:${context.repo.owner}/${context.repo.repo} is:issue is:open "${issueTitle}"`
+            });
+
+            if (existingIssues.data.total_count > 0) {
+              console.log(`Found existing issue for version ${nextVersion}, skipping creation`);
+              return;
+            }
 
             console.log(`Creating issue for failed version: ${nextVersion}`);
 
             await github.rest.issues.create({
               owner: context.repo.owner,
               repo: context.repo.repo,
-              title: `Emulator version update verification failed: ${nextVersion}`,
+              title: issueTitle,
               body: `The verification of the next emulator version ${nextVersion} failed. Please check the [workflow run](${process.env.GITHUB_SERVER_URL}/${context.repo.owner}/${context.repo.repo}/actions/runs/${process.env.GITHUB_RUN_ID}) for details.`
             });
         env:
           NEXT_VERSION: ${{ steps.version-check.outputs.next_version }}
 
-      - name: Create Pull Request
+      - name: Check for existing PRs and create new one if needed
         if: steps.process-versions.outputs.updated == 'true'
         env:
           GH_TOKEN: ${{ secrets.CREATE_PR_PAT }}
           CURRENT_VERSION: ${{ steps.version-check.outputs.current_version }}
           UPDATED_VERSION: ${{ steps.process-versions.outputs.updated_version }}
         run: |
+          # Check for existing PRs with the same title
+          PR_TITLE="chore: update emulator version to $UPDATED_VERSION"
+          EXISTING_PR=$(gh pr list --state open --search "$PR_TITLE" --json number --jq '.[0].number')
+
+          if [ -n "$EXISTING_PR" ]; then
+            echo "Found existing PR #$EXISTING_PR with the same title, skipping PR creation"
+            exit 0
+          fi
+
+          echo "No existing PR found, creating a new one"
+
           # Create and checkout a new branch
           git branch -d bump-base-version &>/dev/null || true  
           git checkout -b bump-base-version
@@ -192,11 +216,9 @@ jobs:
 
           # Create the PR
           gh pr create \
-            --title "chore: update emulator version to $UPDATED_VERSION" \
+            --title "$PR_TITLE" \
             --body "This PR updates the Cloud Spanner emulator version from $CURRENT_VERSION to $UPDATED_VERSION.
             Original Release Notes: https://github.com/GoogleCloudPlatform/cloud-spanner-emulator/releases/tag/v$UPDATED_VERSION
 
             This PR was automatically generated by the check-emulator-version workflow." \
             --base master
-          
-