Enhance GitHub Actions workflow to update or create Docker image comments on PRs. The script now checks for existing comments and updates them if found, ensuring only one comment is present for the Docker image availability.

Author: shyim

.github/workflows/preview.yml

@@ -49,20 +49,44 @@ jobs:
         with:
           script: |
             const imageName = `ghcr.io/${{ steps.repo-name.outputs.REPO_NAME }}/pr-${context.issue.number}:latest`;
-            
-            github.rest.issues.createComment({
-              issue_number: context.issue.number,
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              body: `📦 Docker image for this PR is available at: \`${imageName}\`
+            const commentBody = `📦 Docker image for this PR is available at: \`${imageName}\`
             
             You can pull it with:
             \`\`\`
             docker pull ${imageName}
             docker run ${imageName}
-            \`\`\``
+            \`\`\``;
+
+            // Get all comments on the PR
+            const comments = await github.rest.issues.listComments({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              issue_number: context.issue.number
             });
 
+            // Look for an existing Docker image comment
+            const dockerComment = comments.data.find(comment => 
+              comment.body.includes('📦 Docker image for this PR is available at:')
+            );
+
+            if (dockerComment) {
+              // Update existing comment
+              await github.rest.issues.updateComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                comment_id: dockerComment.id,
+                body: commentBody
+              });
+            } else {
+              // Create new comment
+              await github.rest.issues.createComment({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                issue_number: context.issue.number,
+                body: commentBody
+              });
+            }
+
   # Delete Docker image when PR is closed/merged
   delete-image:
     if: github.event.action == 'closed'