Change CI to run coverage after tests pass (#461)

There are two benefits to this change:
1. The CI will wait for all the coverage to be collected, avoiding
failing a build incorrectly because of code coverage that was not
collected yet
2. Fewer requests to the third-party `codecov` service - we only worry
about code coverage when/if tests pass

.github/workflows/test.yml

@@ -55,10 +55,11 @@ jobs:
         run: |
           hatch run tests.py${{ matrix.python-version }}-${{ matrix.airflow-version }}:test-cov
 
-      - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v3
+      - name: Upload coverage to Github
+        uses: actions/upload-artifact@v2
         with:
-          token: ${{ secrets.CODECOV_TOKEN }}
+          name: coverage-unit-test-${{ matrix.python-version }}-${{ matrix.airflow-version }}
+          path: .coverage
 
   Run-Integration-Tests:
     needs: Authorize
@@ -115,10 +116,11 @@ jobs:
           DATABRICKS_CLUSTER_ID: ${{ secrets.DATABRICKS_CLUSTER_ID }}
           COSMOS_CONN_POSTGRES_PASSWORD: ${{ secrets.COSMOS_CONN_POSTGRES_PASSWORD }}
 
-      - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v3
+      - name: Upload coverage to Github
+        uses: actions/upload-artifact@v2
         with:
-          token: ${{ secrets.CODECOV_TOKEN }}
+          name: coverage-integration-test-${{ matrix.python-version }}-${{ matrix.airflow-version }}
+          path: .coverage
 
 
 
@@ -154,9 +156,6 @@ jobs:
             .nox
           key: integration-expensive-${{ runner.os }}-${{ matrix.python-version }}-${{ matrix.airflow-version }}-${{ hashFiles('pyproject.toml') }}-${{ hashFiles('cosmos/__init__.py') }}
 
-      - name: Checkout pull/${{ github.event.number }}
-        uses: actions/checkout@v3
-
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v4
         with:
@@ -182,7 +181,50 @@ jobs:
           DATABRICKS_CLUSTER_ID: ${{ secrets.DATABRICKS_CLUSTER_ID }}
           COSMOS_CONN_POSTGRES_PASSWORD: ${{ secrets.COSMOS_CONN_POSTGRES_PASSWORD }}
 
+      - name: Upload coverage to Github
+        uses: actions/upload-artifact@v2
+        with:
+          name: coverage-integration-expensive-test-${{ matrix.python-version }}-${{ matrix.airflow-version }}
+          path: .coverage
+
+    env:
+      AIRFLOW_HOME: /home/runner/work/astronomer-cosmos/astronomer-cosmos/
+      AIRFLOW_CONN_AIRFLOW_DB: postgres://postgres:[email protected]:5432/postgres
+      PYTHONPATH: /home/runner/work/astronomer-cosmos/astronomer-cosmos/:$PYTHONPATH
+      AIRFLOW_CONN_DATABRICKS_DEFAULT: ${{ secrets.AIRFLOW_CONN_DATABRICKS_DEFAULT }}
+      DATABRICKS_HOST: ${{ secrets.DATABRICKS_HOST }}
+      DATABRICKS_TOKEN: ${{ secrets.DATABRICKS_TOKEN }}
+      DATABRICKS_WAREHOUSE_ID: ${{ secrets.DATABRICKS_WAREHOUSE_ID }}
+      DATABRICKS_CLUSTER_ID: ${{ secrets.DATABRICKS_CLUSTER_ID }}
+
+  Code-Coverage:
+    if: github.event.action != 'labeled'
+    needs:
+      - Run-Unit-Tests
+      - Run-Integration-Tests
+      - Run-Integration-Tests-Expensive
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Python 3.10
+        uses: actions/setup-python@v3
+        with:
+          python-version: '3.10'
+      - name: Install coverage
+        run: |
+          pip3 install coverage
+      - name: Download all coverage artifacts
+        uses: actions/download-artifact@v2
+        with:
+          path: ./coverage
+      - name: Combine coverage
+        run: |
+          coverage combine ./coverage/coverage*/.coverage
+          coverage report
+          coverage xml
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@v3
         with:
+          fail_ci_if_error: true
           token: ${{ secrets.CODECOV_TOKEN }}
+          files: coverage.xml