fix: use fenced code blocks for multi-line error messages in PR comments

Co-Authored-By: Niels Swimberghe <3382717+Swimburger@users.noreply.github.com>

Author: devin-ai-integration[bot]

dist/index.js

@@ -39703,10 +39703,10 @@ async function pushWithFallback(branchName, owner, repo, octokit) {
             `- Merge or close this PR so the next run creates a fresh one, or\n` +
             `- Manually rebase this branch on \`${github.context.ref.replace("refs/heads/", "")}\` and re-run the workflow.`;
         if (errorMsg) {
-            commentBody += `\n\n**${errorLabel}:** \`${errorMsg}\``;
+            commentBody += `\n\n**${errorLabel}:**\n\`\`\`\n${errorMsg}\n\`\`\``;
         }
         if (abortErrorMsg) {
-            commentBody += `\n**Rebase abort error:** \`${abortErrorMsg}\` — the working tree may be in an unexpected state.`;
+            commentBody += `\n\n**Rebase abort error:**\n\`\`\`\n${abortErrorMsg}\n\`\`\`\n— the working tree may be in an unexpected state.`;
         }
         await octokit.rest.issues.createComment({
             owner,

src/sync.test.ts

@@ -376,6 +376,7 @@ describe("updateFromSourceSpec", () => {
             expect(commentCall.body).toContain("Sync failed");
             expect(commentCall.body).toContain("merge conflicts");
             expect(commentCall.body).toContain("Rebase error:");
+            expect(commentCall.body).toContain("```");
             expect(commentCall.body).toContain("CONFLICT (content)");
             expect(commentCall.body).toContain("could not apply");
 
@@ -553,6 +554,7 @@ describe("updateFromSourceSpec", () => {
 
             const commentCall = mockIssuesCreateComment.mock.calls[0][0];
             expect(commentCall.body).toContain("Rebase error:");
+            expect(commentCall.body).toContain("```");
             expect(commentCall.body).toContain("merge conflict");
             expect(commentCall.body).toContain("Rebase abort error:");
             expect(commentCall.body).toContain("no rebase in progress");

src/sync.ts

@@ -611,10 +611,10 @@ async function pushWithFallback(
             `- Manually rebase this branch on \`${github.context.ref.replace("refs/heads/", "")}\` and re-run the workflow.`;
 
         if (errorMsg) {
-            commentBody += `\n\n**${errorLabel}:** \`${errorMsg}\``;
+            commentBody += `\n\n**${errorLabel}:**\n\`\`\`\n${errorMsg}\n\`\`\``;
         }
         if (abortErrorMsg) {
-            commentBody += `\n**Rebase abort error:** \`${abortErrorMsg}\` — the working tree may be in an unexpected state.`;
+            commentBody += `\n\n**Rebase abort error:**\n\`\`\`\n${abortErrorMsg}\n\`\`\`\n— the working tree may be in an unexpected state.`;
         }
 
         await octokit.rest.issues.createComment({