Add TMT test structure and basic smoke test

- Add tests/.fmf/version to mark the FMF root for TMT.
- Add tests/core.fmf: smoke test (tagged 'smoke') for TMT gating.
- Add tests/tmt-main.fmf: TMT plan to discover and run smoke tests.
- Add .github/workflows/tmt-tests.yml: GitHub Actions workflow to run
  TMT tests.

Author: aaradhak

.fmf/version

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+1

.github/workflows/tmt-tests.yml

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+name: TMT Tests
+
+on:
+  push:
+    branches: 
+      - main
+  pull_request:
+    branches:
+      - main
+  workflow_dispatch:
+    inputs:
+      plan_filter:
+        description: |
+          Test plan filter name, ie: tag:smoke.
+          If provided, only tests matching this filter will be run, otherwise all tests will be run.
+        required: false
+        default: ''
+
+jobs:
+  tmt-tests:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Install dependencies
+        run: |
+          set -x -e -o pipefail
+          sudo apt-get update
+          sudo apt-get install -y podman libblkid-dev rsync
+          pip install --user tmt
+
+      - name: Run TMT tests
+        run: |
+          set -x -e -o pipefail
+          if [ "$ACT" = "true" ]; then
+            echo "Running locally using ACT"
+            TMT_PROVISION_OPTS="--how local --feeling-safe"
+          else
+            TMT_PROVISION_OPTS="--how container"
+          fi
+          if [ -n "${{ github.event.inputs.plan_filter }}" ]; then
+            PLAN_FILTER_PARAM="plan --filter '${{ github.event.inputs.plan_filter }}'"
+          fi
+          eval "tmt run --all --debug -vvvv provision $TMT_PROVISION_OPTS $PLAN_FILTER_PARAM"

tests/core/core.fmf

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+summary: check for presence of main files from the package
+tag:
+  - smoke
+test: |
+  set -e
+  test -f /usr/lib/console-login-helper-messages/libutil.sh
+  test -f /usr/share/doc/console-login-helper-messages/README.md

tests/tmt/plans/main.fmf

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+discover:
+  how: fmf
+  filter: "tag: smoke"
+execute:
+  how: tmt
+
+# This prepare is used to control when console-login-helper-messages is installed using
+# the distribution package or when it is built from source in the test environment
+prepare:
+  - name: Set CLHM_BIN_DIR when built from source
+    when: use_built_from_src is defined and use_built_from_src == true
+    how: shell
+    script: |
+      set -x -e -o pipefail
+      echo "Preparing the test environment"
+      CLHM_BIN_NAME="gensnippet_if"
+      PARENT_DIR=$(dirname "${TMT_TREE}")
+      CLHM_BIN_FULL_PATH=$(find "${PARENT_DIR}" -type f -name "${CLHM_BIN_NAME}")
+      if [ -z "${CLHM_BIN_FULL_PATH}" ]; then
+          echo "gensnippet_if file not found."
+          exit 1
+      fi
+      CLHM_BIN_DIR=$(dirname "${CLHM_BIN_FULL_PATH}")
+      echo "CLHM_BIN_DIR=${CLHM_BIN_DIR}" > /tmp/clhm_bin_dir
+  - name: Install console-login-helper-messages package
+    when: use_built_from_src is not defined or use_built_from_src == false
+    how: install
+    package: console-login-helper-messages
+  - name: Set CLHM_BIN_DIR when installed package
+    when: use_built_from_src is not defined or use_built_from_src == false
+    how: shell
+    script: |
+      set -x -e -o pipefail
+      echo "CLHM_BIN_DIR=/usr/libexec/console-login-helper-messages"  > /tmp/clhm_bin_dir

tests/tmt/plans/smoke.fmf

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+summary: Basic smoke test
+tag:
+  - smoke
+discover:
+  how: fmf
+  filter: "tag: smoke"
+execute:
+  how: tmt