fixup! testing: Add a simple test to run each plugin in isolation

Author: cdecker

.github/workflows/main.yml

@@ -15,6 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 45
     strategy:
+      fail-fast: false
       matrix:
         python-version: [3.6, 3.7, 3.8]
         developer: [1]