Use tmt and osci for gating

.fmf/version

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+1

gating.yaml

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+--- !Policy
+
+product_versions:
+  - rhel-9
+decision_context: osci_compose_gate
+rules:
+  - !PassingTestCaseRule {test_case_name: osci.brew-build.tier0.functional}
+

plan.fmf

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+discover:
+  how: shell
+  dist-git-source: true
+  tests:
+  - name: unit
+    test: pytest-3 $TMT_SOURCE_DIR/sphinxcontrib-websupport-*/tests -v
+    require:
+    - python3-pytest
+    - python3-sphinxcontrib-websupport
+    - python3-sqlalchemy
+
+prepare:
+  - how: feature
+    crb: enabled
+
+execute:
+  how: tmt