Add gating

Adds gating configuration, tmt plan and single test executing similar
code as %check does.

.fmf/version

@@ -0,0 +1 @@
+1

gating.yaml

@@ -0,0 +1,6 @@
+--- !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 +1,8 @@
+execute:
+    how: tmt
+
+discover:
+    dist-git-source: true
+    dist-git-merge: true
+    how: fmf
+    dist-git-install-builddeps: true

tests/unit.fmf

@@ -0,0 +1,9 @@
+test: |
+    cd $(dirname $TMT_SOURCE_DIR/*/spec)
+    export LANG=C.UTF-8
+    rspec spec
+require:
+- rubygem-diff-lcs
+- rubygem(rspec)
+tag:
+- rhel-buildroot