Add initial TMT Gating Test

This adds a TMT plan for the gating test, which will currently
run a smoke tests only that are defined in the ignition upstream
repository: https://github.com/coreos/ignition
Verify the upstream repository PR for additional refrence:
https://github.com/coreos/ignition/pull/2076

JIRA: https://issues.redhat.com/browse/COS-2284

Signed-off-by: Tiago Bueno <tbueno@redhat.com>

.fmf/version

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

gating.yaml

@@ -3,4 +3,4 @@ product_versions:
  - rhel-10
 decision_context: osci_compose_gate
 rules:
- - !PassingTestCaseRule {test_case_name: osci.brew-build.tier0.functional}   # this is the testcase identifier, which OSCI pipeline uses
+ - !PassingTestCaseRule {test_case_name: osci.brew-build./tests/tmt/plans/smoke}   # this is the testcase identifier, which OSCI pipeline uses

tests/tests.yml

@@ -1,3 +1,4 @@
+---
 - hosts: localhost
   roles:
     - role: standard-test-basic
@@ -19,3 +20,4 @@
         - ignition-validate-rpm-installed:
            dir: ./
            run: /usr/bin/rpm -q ignition-validate
+

tests/tmt/plans/main.fmf

@@ -0,0 +1,16 @@
+---
+adjust:
+    enabled: false
+    when: distro == centos-stream or distro == fedora
+prepare:
+  - name: Install ignition package
+    when: use_built_form_src is not defined or use_built_form_src == false
+    how: install
+    package: ignition
+  - name: Set IGNITION_BIN_DIR when installed package
+    when: use_built_form_src is not defined or use_built_form_src == false
+    how: shell
+    script: |
+      set -x -e -o pipefail
+      echo "IGNITION_BIN_DIR=/usr/lib/dracut/modules.d/30ignition" > /tmp/ignition_bin_dir
+

tests/tmt/plans/smoke.fmf

@@ -0,0 +1,12 @@
+---
+summary: Run gating tests
+tag: 
+  - smoke
+discover:
+    - name: Internal gating tests
+      how: fmf
+      url: https://github.com/coreos/ignition.git
+      filter: 'tag: smoke'
+execute:
+    how: tmt
+