chore: skip CI on draft PR (#12666)

.github/workflows/superset-python-unittest.yml

@@ -6,9 +6,11 @@ on:
     branches-ignore:
       - "dependabot/npm_and_yarn/**"
   pull_request:
+    types: [synchronize, opened, reopened, ready_for_review]
 
 jobs:
   test-mysql:
+    if: github.event.pull_request.draft == false
     runs-on: ubuntu-20.04
     strategy:
       matrix:
@@ -55,6 +57,7 @@ jobs:
           bash <(curl -s https://codecov.io/bash) -cF python
 
   test-postgres:
+    if: github.event.pull_request.draft == false
     runs-on: ubuntu-20.04
     strategy:
       matrix:
@@ -102,6 +105,7 @@ jobs:
           bash <(curl -s https://codecov.io/bash) -cF python
 
   test-sqlite:
+    if: github.event.pull_request.draft == false
     runs-on: ubuntu-20.04
     strategy:
       matrix: