Enable gating & add gating test

Resolves: RHEL-52149

.fmf/version

@@ -0,0 +1 @@
+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

@@ -0,0 +1,12 @@
+discover:
+  - name: OpenBLAS-srpm-macros-existence-test
+    how: shell
+    tests:
+    - name: macros-existence-test
+      test: |
+        [ "$(rpm --eval '%{openblas_arches}')" != "%{openblas_arches}" ]
+      require:
+      - openblas-srpm-macros
+      duration: 1m
+execute:
+  how: tmt