Add tmt gating plan

Resolves: rhbz#2159304

.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
+discover:
+  - how: shell
+    dist-git-source: true
+    tests:
+    - name: bundled demos
+      require:
+      - python3.11-devel
+      - python3.11-numpy
+      - gcc-c++
+      - gcc
+      test: |
+        cd $TMT_SOURCE_DIR/cython-*/Demos &&
+        sed 's/python /python3.11 /' -i Makefile &&
+        make test
+  - how: fmf

tests/helloworld.pyx

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+# https://cython.readthedocs.io/en/latest/src/tutorial/cython_tutorial.html
+print("Hello World")
+
+def works():
+    return True

tests/main.fmf

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+test: ${PYTHON:-python3} tutorial.py
+

tests/tutorial.py

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+import pyximport
+pyximport.install()
+
+import helloworld
+assert helloworld.works()