Add alls-green CI job to check if all test jobs passed

Author: CAM-Gerlach

.github/workflows/tests.yaml

@@ -112,3 +112,18 @@ jobs:
         if: matrix.PYTHON_VERSION == '3.8'
         shell: bash -el {0}
         run: coveralls
+
+  check:
+    name: 'Check job status'
+    if: always()
+
+    needs:
+    - test
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Determine if all required jobs succeeded
+      uses: re-actors/alls-green@release/v1
+      with:
+        jobs: ${{ toJSON(needs) }}