re-add pytest-cov; this time with the correct changes

.github/workflows/downstream_testing.yml

@@ -67,6 +67,15 @@ jobs:
             workflow_name: "test.yml"
             matrix_exclude: ""
 
+          - name: "pytest-cov"
+            repo: "pytest-dev/pytest-cov"
+            docker_profile: "nodb"
+            jobs: "test"
+            workflow_name: "test.yml"
+            # Exclude pypy3 for now; stil working on a suitable regex substitution
+            matrix_exclude: |
+              3.6 pypy-3.6 pypy-3.7
+
     steps:
     - uses: actions/checkout@v2
       with:

testing/downstream_testing/action_schemas.json

@@ -58,5 +58,20 @@
                     "replace": "py\\1\\2"
                 }
         }
+    },
+    "pytest-cov": {
+        "matrix": [
+            "matrix",
+            "python-version"
+        ],
+        "tox_cmd_build": {
+            "base": "",
+            "prefix": "",
+            "sub":
+                {
+                    "pattern": "^\\d\\.(\\d+)(?:-dev)*",
+                    "replace": "py3\\1"
+                }
+        }
     }
 }