Add gating configuration

.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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+execute:
+  how: tmt
+environment:
+  PYTHON: python3.12
+discover:
+  - how: shell
+    dist-git-source: true
+    tests:
+    - name: bundled demos
+      require:
+      - python3.12-devel
+      - python3.12-numpy
+      - python3.12-setuptools
+      - gcc-c++
+      - gcc
+      - make
+      test: |
+        cd $TMT_SOURCE_DIR/cython-*/Demos &&
+        sed "s/\bpython\b/python3.12/" -i Makefile callback/Makefile \
+                                          embed/Makefile  &&
+        make test
+  - how: fmf