Add smoke test for tmt

Used in gating

Related: bz#1950291

.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}

plans.fmf

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+discover:
+    how: fmf
+execute:
+    how: tmt

tests/smoke.fmf

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+test: bash ./smoke.sh
+framework: shell

tests/smoke.sh

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+#!/bin/bash
+set -ex
+
+username="test_$$"
+id "$username" && userdel -rf "$username"
+
+useradd "$username"
+su -l -c "echo simple-manylinux-demo > requirements.txt" "$username"
+su -l -c "micropipenv install -- --user" "$username"
+su -l -c "python3 -c 'from dummyextension.extension import hello; assert hello() == \"Hello from Python extension!\"'" "$username"
+
+userdel -rf "$username"