fix: try to enable automerge if disabled on synchronize

src/events/pr-handlers/synchronize.ts

@@ -4,6 +4,8 @@ import { getChecksAndStatusesForPullRequest } from '../../utils/github/pullReque
 import { autoMergeIfPossible } from './actions/autoMergeIfPossible';
 import { calcAndUpdateLabels } from './actions/calcAndUpdateLabels';
 import { editOpenedPR } from './actions/editOpenedPR';
+import { enableGithubAutoMerge } from './actions/enableGithubAutoMerge';
+import hasLabelInPR from './actions/utils/labels/hasLabelInPR';
 import { calcStepsState } from './actions/utils/steps/calcStepsState';
 import { createPullRequestHandler } from './utils/createPullRequestHandler';
 import { fetchPr } from './utils/fetchPr';
@@ -70,13 +72,32 @@ export default function synchronize(app: Probot, appContext: AppContext): void {
         checksAndStatuses,
       });
 
-      // call autoMergeIfPossible to re-add to the queue when push is fixed
-      await autoMergeIfPossible(
-        updatedPr,
-        context,
-        repoContext,
-        reviewflowPrContext,
-      );
+      if (
+        repoContext.settings.allowAutoMerge &&
+        repoContext.config.experimentalFeatures?.githubAutoMerge
+      ) {
+        const autoMergeLabel = repoContext.labels['merge/automerge'];
+
+        if (
+          !pullRequest.auto_merge &&
+          hasLabelInPR(pullRequest.labels, autoMergeLabel)
+        ) {
+          await enableGithubAutoMerge(
+            pullRequest,
+            context,
+            repoContext,
+            reviewflowPrContext,
+          );
+        }
+      } else {
+        // call autoMergeIfPossible to re-add to the queue when push is fixed
+        await autoMergeIfPossible(
+          updatedPr,
+          context,
+          repoContext,
+          reviewflowPrContext,
+        );
+      }
     },
   );
 }