Run cherry-pick asynchronously

Author: codebytere

lib/promote_release.js

@@ -111,7 +111,7 @@ class ReleasePromotion {
       cli.warn(`Aborting release promotion for version ${version}`);
       return;
     }
-    this.cherryPickToMaster();
+    await this.cherryPickToMaster();
 
     // There will be cherry-pick conflicts the Releaser will
     // need to resolve, so confirm they've been resolved before
@@ -317,7 +317,7 @@ class ReleasePromotion {
     await runAsync('./tools/release.sh', ['-i', keyPath]);
   }
 
-  cherryPickToMaster() {
+  async cherryPickToMaster() {
     // Since we've committed the Working On commit, the release
     // commit will be 1 removed from tip-of-tree (e.g HEAD~1).
     const releaseCommitSha = this.getCommitSha(1);
@@ -327,7 +327,7 @@ class ReleasePromotion {
     runSync('git', ['pull', '--rebase', 'upstream', 'master']);
 
     // There will be conflicts.
-    runSync('git', ['cherry-pick', releaseCommitSha]);
+    await runAsync('git', ['cherry-pick', releaseCommitSha]);
   }
 }