Add gating

Just a simple import test, better than nothing

.fmf/version

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+1

gating.yaml

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+--- !Policy
+product_versions:
+  - rhel-8
+decision_context: osci_compose_gate
+rules:
+  - !PassingTestCaseRule {test_case_name: osci.brew-build.tier0.functional}

plan.fmf

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+execute:
+  how: tmt
+
+discover:
+  - name: same_repo
+    how: shell
+    tests:
+      - name: import test
+        test: /usr/libexec/platform-python -c "import setuptools_scm"
+
+prepare:
+  - name: enable crb
+    how: feature
+    crb: enabled
+
+  - name: install packages
+    how: install
+    package:
+      - python3-setuptools_scm