Add gating and smoke test

.fmf/version

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+1

gating.yaml

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+--- !Policy
+product_versions:
+  - rhel-10
+decision_context: osci_compose_gate
+rules:
+  - !PassingTestCaseRule {test_case_name: osci.brew-build.tier0.functional}

plans/main.fmf

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+execute:
+    how: tmt
+
+discover:
+    how: shell
+    tests:
+    - name: run help
+      test: highlight --help
+    - name: run on one suplied file
+      test: highlight /usr/share/highlight/plugins/cpp_qt.lua | grep html