Enable gating tests

Add a gating.yaml to make sure that newer cockpit-podman versions don't
enter stable when they cause regressions in various static RPM checks or
our CI tests.

See https://docs.pagure.org/greenwave/policies.html

gating.yaml

@@ -0,0 +1,12 @@
+--- !Policy
+product_versions:
+  - fedora-33
+  - fedora-rawhide
+decision_context: bodhi_update_push_stable
+rules:
+  - !PassingTestCaseRule {test_case_name: dist.rpmdeplint}
+  - !PassingTestCaseRule {test_case_name: dist.rpmgrill}
+  - !PassingTestCaseRule {test_case_name: dist.rpmlint}
+  - !PassingTestCaseRule {test_case_name: dist.python-versions}
+  - !PassingTestCaseRule {test_case_name: dist.abicheck}
+  - !PassingTestCaseRule {test_case_name: fedora-ci.koji-build.tier0.functional}