better control of CI testing

more fine grained. No CI on draft PR, but listen for ready_to_review event

Author: leokim-l

.github/workflows/maven.yml

@@ -12,14 +12,24 @@ on:
   push:
     branches: [ "master" ]
   pull_request:
-    branches: [ "master" , "develop"]
+    branches: [ "master", "develop" ]
+    types: [opened, synchronize, reopened, ready_for_review]
+  workflow_dispatch: 
 
 jobs:
   build:
     if: |
-        (github.event_name == 'push') ||
-        (github.event.pull_request.base.ref == 'master') ||
-        (github.event.pull_request.base.ref == 'develop' && github.event.action == 'closed')
+      github.event_name == 'push' ||
+      (
+        github.event_name == 'pull_request' &&
+        (github.event.pull_request.base.ref == 'master' || github.event.pull_request.base.ref == 'develop') &&
+        !github.event.pull_request.draft
+      ) ||
+      (
+        github.event_name == 'pull_request' &&
+        github.event.action == 'closed' &&
+        github.event.pull_request.base.ref == 'develop'
+      )
 
     strategy:
       matrix: