fixup! fix: retain main in mixed PR target lists

Author: panva

lib/ci/failure_aggregator.js

@@ -31,10 +31,11 @@ function formatTargetBranches(pr, markdown = false) {
   if (pr.targetBranches.length === 1 && pr.targetBranches[0] === 'main') {
     return '';
   }
-  const branches = pr.targetBranches.map(branch => markdown
-    ? branch.replace(/[&<>"'\\`*_[\]{}()!|~]/g, char => `&#${char.charCodeAt(0)};`)
-    : branch);
-  return branches.length ? ` (target: ${branches.join(', ')})` : '';
+  const branches = markdown
+    ? pr.targetBranches.map(branch =>
+      branch.replace(/[&<>"'\\`*_[\]{}()!|~]/g, char => `&#${char.charCodeAt(0)};`))
+    : pr.targetBranches;
+  return ` (target: ${branches.join(', ')})`;
 }
 
 export class FailureAggregator {