Add tmt plan for crun aarch64 gating tests

Signed-off-by: Alex Jia <ajia@redhat.com>

.fmf/version

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+1

plans/main.fmf

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+summary: Test plan for crun
+description: Test plan for crun
+contact: Alex Jia <ajia@redhat.com>
+
+provision:
+  how: container
+
+prepare:
+  - name: Install packages
+    how: install
+    package: [crun, podman, podman-tests, git]
+  - name: Prepare bats
+    how: shell
+    script:
+      - rm -rf /tmp/bats
+      - git clone https://github.com/bats-core/bats-core.git /tmp/bats
+      - /tmp/bats/install.sh /usr
+
+discover:
+    how: fmf
+    filter: 'tag: gate'
+    url: https://gitlab.cee.redhat.com/ajia/crun
+    ref: rhel-9
+
+execute:
+    how: tmt
+
+adjust:
+    enabled: false
+    when: distro == centos-stream or distro == fedora