Fix super-linter on PRs

See: https://github.com/github/super-linter#example-connecting-github-action-workflow

.github/workflows/push.yml

@@ -14,6 +14,9 @@ jobs:
     name: Checks syntax of our code
     steps:
     - uses: actions/checkout@v2
+      with:
+        # Full git history is needed to get a proper list of changed files within `super-linter`
+        fetch-depth: 0
     - uses: actions/setup-python@v2
     - name: Lint Code Base
       uses: github/super-linter@v3