Explicitly display operating system on run

Author: rhpvorderman

.github/workflows/ci.yml

@@ -78,7 +78,7 @@ jobs:
         uses: codecov/codecov-action@v1
 
   test-dynamic:
-    runs-on: ubuntu-20.04
+    runs-on: ${{ matrix.os }}
     needs: lint
     strategy:
       matrix:
@@ -87,9 +87,9 @@ jobs:
           - 3.7
           - 3.8
           - 3.9
+         os: ["ubuntu-20.04"]
     steps:
-      - name: Install python 3.6
-        uses: actions/[email protected]
+      - uses: actions/[email protected]
         with:
           submodules: recursive
       - name: Set up Python ${{ matrix.python-version }}