build: split python CI jobs (#11794)

* build: split python CI jobs

* Rename superset-python.yml to superset-python-misc.yml

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

@@ -0,0 +1,52 @@
+# Python Postgres unit tests
+name: Python Postgres
+
+on: [push, pull_request]
+
+jobs:
+  test-postgres:
+    runs-on: ubuntu-18.04
+    strategy:
+      matrix:
+        python-version: [3.7, 3.8]
+    env:
+      PYTHONPATH: ${{ github.workspace }}
+      SUPERSET_CONFIG: tests.superset_test_config
+      REDIS_PORT: 16379
+      SUPERSET__SQLALCHEMY_DATABASE_URI: postgresql+psycopg2://superset:superset@127.0.0.1:15432/superset
+    services:
+      postgres:
+        image: postgres:10-alpine
+        env:
+          POSTGRES_USER: superset
+          POSTGRES_PASSWORD: superset
+        ports:
+          # Use custom ports for services to avoid accidentally connecting to
+          # GitHub action runner's default installations
+          - 15432:5432
+      redis:
+        image: redis:5-alpine
+        ports:
+          - 16379:6379
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install dependencies
+        uses: apache-superset/cached-dependencies@b90713b
+        with:
+          run: |
+            apt-get-install
+            pip-upgrade
+            pip install -r requirements/testing.txt
+            setup-postgres
+      - name: Run celery
+        run: celery worker --app=superset.tasks.celery_app:app -Ofair -c 2 &
+      - name: Python unit tests (PostgreSQL)
+        run: |
+          ./scripts/python_tests.sh
+      - name: Upload code coverage
+        run: |
+          bash <(curl -s https://codecov.io/bash) -cF python