Add initial gating test

Only add an initial basic functionnal test as this package is tested in
upstream and downstream CI.

Resolves: rhbz#2013681

gating.yaml

@@ -0,0 +1,6 @@
+--- !Policy
+product_versions:
+  - rhel-9
+decision_context: osci_compose_gate
+rules:
+  - !PassingTestCaseRule {test_case_name: osci.brew-build.tier0.functional}   # this is the testcase identifier, which OSCI pipeline uses

tests/tests.yml

@@ -0,0 +1,9 @@
+- hosts: localhost
+  roles:
+  - role: standard-test-basic
+    tags:
+    - classic
+    tests:
+    - simple:
+        dir: .
+        run: "butane --help"