Add tmt lint workflow (#23)

* Add tmt lint workflow

* Add missing GH org

.github/workflows/tft.yml

@@ -48,7 +48,7 @@ jobs:
       - name: Checkout postfix repo
         uses: actions/checkout@v4
         with:
-          repository: postfix
+          repository: ${{ github.repository_owner }}/postfix
           ref: main
 
       - name: Get memory

.github/workflows/tmt_lint.yml

@@ -0,0 +1,37 @@
+---
+name: tmt Lint
+on:  # yamllint disable-line rule:truthy
+  pull_request:
+  merge_group:
+    branches:
+      - main
+    types:
+      - checks_requested
+  push:
+    branches:
+      - main
+  workflow_dispatch:
+permissions:
+  contents: read
+jobs:
+  tmt_lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Install podman
+        run: |
+          set -euxo pipefail
+          sudo apt update
+          sudo apt install -y podman
+
+      - name: Checkout repo
+        uses: actions/checkout@v4
+        with:
+          path: tft-tests
+
+      - name: Run tmt Lint
+        run: >
+          podman run -it
+          --volume ./tft-tests:/tft-tests:Z
+          --workdir /tft-tests
+          --rm quay.io/testing-farm/tmt
+          tmt lint