fix: resolve all YAML template literal issues in merge-bot workflow (#22)

* fix: resolve YAML syntax error in merge-bot workflow template literal

Fix template literal interpolation issue by extracting pr.base.ref to
a local variable before using it in the comment body. This prevents
YAML parsing errors with the GitHub Actions workflow.

The issue occurs when GitHub Actions tries to parse the workflow file
and encounters ${pr.base.ref} inside a JavaScript template literal,
which can be confused with GitHub Actions variable interpolation syntax.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

* fix: resolve all YAML template literal issues in merge-bot workflow

Replace all problematic template literals with backticks inside YAML with
array-based string construction using .join('\n'). This prevents YAML parser
errors when GitHub Actions tries to validate the workflow file.

Changes:
- Fork PR message: Use array of strings instead of multiline template literal
- Success message: Extract to variable to avoid inline template complexity
- Failure message: Use array of strings for code block formatting

This approach avoids:
- Escaped backticks in YAML (\`\`\`)
- Complex template literals inside YAML string literals
- YAML scanner errors with 'could not find expected :'

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

---------

Co-authored-by: Claude <noreply@anthropic.com>

Author: vilsonrodrigues

.github/workflows/merge-bot.yml

@@ -410,21 +410,25 @@ jobs:
               core.setOutput('is_fork', 'true');
 
               const baseBranch = pr.base.ref;
+              const forkMessage = [
+                'ℹ️ Update commands are not supported for PRs from forks.',
+                '',
+                'To update your branch, please run these commands locally:',
+                '',
+                '```bash',
+                `git fetch upstream ${baseBranch}`,
+                `git merge upstream/${baseBranch}`,
+                'git push',
+                '```',
+                '',
+                'Or create a new PR from the same repository.'
+              ].join('\n');
+
               await github.rest.issues.createComment({
                 owner: context.repo.owner,
                 repo: context.repo.repo,
                 issue_number: context.payload.issue.number,
-                body: `ℹ️ Update commands are not supported for PRs from forks.
-
-To update your branch, please run these commands locally:
-
-\`\`\`bash
-git fetch upstream ${baseBranch}
-git merge upstream/${baseBranch}
-git push
-\`\`\`
-
-Or create a new PR from the same repository.`
+                body: forkMessage
               });
 
               return;
@@ -600,13 +604,13 @@ Or create a new PR from the same repository.`
             const baseBranch = '${{ steps.pr_info.outputs.base_branch }}';
             const commitsBehind = '${{ steps.check_update.outputs.commits_behind }}';
 
+            const successMessage = `✅ Branch updated successfully by @${user}!\n\nMerged ${commitsBehind} commit(s) from \`${baseBranch}\`.`;
+
             await github.rest.issues.createComment({
               owner: context.repo.owner,
               repo: context.repo.repo,
               issue_number: context.payload.issue.number,
-              body: `✅ Branch updated successfully by @${user}!
-
-Merged ${commitsBehind} commit(s) from \`${baseBranch}\`.`
+              body: successMessage
             });
 
             // Add +1 reaction to original comment
@@ -624,21 +628,25 @@ Merged ${commitsBehind} commit(s) from \`${baseBranch}\`.`
           script: |
             const baseBranch = '${{ steps.pr_info.outputs.base_branch }}';
 
+            const failureMessage = [
+              `❌ Failed to update branch with latest changes from \`${baseBranch}\`.`,
+              '',
+              'This usually means there are merge conflicts that need to be resolved manually.',
+              '',
+              'Please update your branch locally:',
+              '```bash',
+              `git fetch origin ${baseBranch}`,
+              `git merge origin/${baseBranch}`,
+              '# Resolve conflicts',
+              'git push',
+              '```'
+            ].join('\n');
+
             await github.rest.issues.createComment({
               owner: context.repo.owner,
               repo: context.repo.repo,
               issue_number: context.payload.issue.number,
-              body: `❌ Failed to update branch with latest changes from \`${baseBranch}\`.
-
-This usually means there are merge conflicts that need to be resolved manually.
-
-Please update your branch locally:
-\`\`\`bash
-git fetch origin ${baseBranch}
-git merge origin/${baseBranch}
-# Resolve conflicts
-git push
-\`\`\``
+              body: failureMessage
             });
 
             // Add -1 reaction to original comment