Extend github checks to all .github

Do not limit conftest to check .github/workflows but also check the
rest of .github hierarchy. Also some checks against dependabot.yml are
done!

Author: iamleot

.github/workflows/conftest.yml

@@ -18,4 +18,4 @@ jobs:
         env:
           CONFTEST_POLICIES: git::https://github.com/iamleot/conftest-policies.git//policy/github
         with:
-          args: test --all-namespaces --update "${{ env.CONFTEST_POLICIES }}" .github/workflows
+          args: test --all-namespaces --update "${{ env.CONFTEST_POLICIES }}" .github