squash! Publish artifacts from release branches separately

Also, publish artifacts from PR builds into separate bucket.

.drone.yml

@@ -209,10 +209,23 @@ pipeline:
       - 'cp $BIN/vic_${DRONE_BUILD_NUMBER}.tar.gz bundle-release/vic_`git describe --tags --abbrev=0)`.tar.gz'
     when:
       repo: vmware/vic
-      branch: [master, 'releases/*']
-      event: [push, tag]
       status: [success, failure]
 
+  publish-gcs-builds-for-pr:
+    image: 'victest/drone-gcs:1'
+    pull: true
+    secrets:
+      - google_key
+    source: bundle
+    target: vic-engine-pr-builds/pull/${DRONE_PULL_REQUEST}/
+    acl:
+      - 'allUsers:READER'
+    cache_control: 'public,max-age=3600'
+    when:
+      repo: vmware/vic
+      event: pull_request
+      status: success
+
   publish-gcs-builds-on-master-push-pass:
     image: 'victest/drone-gcs:1'
     pull: true