Update lint workflow to replace or update PR comment instead of duplicating it

Author: alexaka1

.github/workflows/lint.yml

@@ -50,13 +50,26 @@ jobs:
             const output = fs.readFileSync('lint-output.txt', 'utf8');
             const exitCode = '${{ steps.lint.outputs.exit_code }}';
             const title = exitCode === '0' ? '✅ Lint passed' : '❌ Lint found issues';
-            const body = `### ${title}\n\n<details><summary>Show output</summary>\n\n\`\`\`\n${output.slice(-60000)}\n\`\`\`\n\n</details>`;
+            const marker = '<!-- lint-report:adev-nextjs-blog -->';
+            const body = `${marker}\n### ${title}\n\n<details><summary>Show output</summary>\n\n\`\`\`\n${output.slice(-60000)}\n\`\`\`\n\n</details>`;
             const { owner, repo } = context.repo;
             const issue_number = context.issue.number;
             if (!issue_number) {
               core.info('No pull request context detected, skipping comment.');
             } else {
-              await github.rest.issues.createComment({ owner, repo, issue_number, body });
+              // Find existing comment with the marker and update it; otherwise create a new one
+              const comments = await github.paginate(github.rest.issues.listComments, {
+                owner,
+                repo,
+                issue_number,
+                per_page: 100,
+              });
+              const existing = comments.find(c => typeof c.body === 'string' && c.body.includes(marker));
+              if (existing) {
+                await github.rest.issues.updateComment({ owner, repo, comment_id: existing.id, body });
+              } else {
+                await github.rest.issues.createComment({ owner, repo, issue_number, body });
+              }
             }
 
       - name: Fail if lint failed