Add basic tier0 smoke tests

Copied from c9s.

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}
+  - !PassingTestCaseRule {test_case_name: rhsmci.brew-build.tier1.functional}
+

tests/smoke/smoke.sh

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+#!/bin/bash
+
+set -e
+set -o pipefail
+
+# Check that both PEM files are installed and these files are really PEM files
+file /etc/rhsm/ca/redhat-entitlement-authority.pem | grep -q "/etc/rhsm/ca/redhat-entitlement-authority.pem: PEM certificate"
+file /etc/rhsm/ca/redhat-uep.pem | grep -q "/etc/rhsm/ca/redhat-uep.pem: PEM certificate"
+

tests/tests.yml

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+---
+- hosts: localhost
+  tags:
+  - classic
+  - atomic
+  roles:
+  - role: standard-test-basic
+    tests:
+    - smoke:
+        dir: smoke
+        run: ./smoke.sh
+