ci: single runner, ubuntu-2204 only, fail-fast on first molecule failure

Use a single molecule test job (no matrix) on ubuntu-2204 only. This
stops the workflow immediately when the first scenario fails instead of
wasting time running 3 parallel runners that all fail for the same
reason. Multi-platform will be restored once the base scenarios pass.

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

.gitea/workflows/ci.yml

@@ -29,42 +29,26 @@ jobs:
   molecule-tests:
     needs: quality
     runs-on: docker
-    strategy:
-      fail-fast: true
-      max-parallel: 1
-      matrix:
-        runner-index: [0, 1, 2]
     steps:
       - uses: actions/checkout@v4
       - name: Set up environment
         run: make setup
-      - name: Discover assigned test pairs
+      - name: Run all molecule tests
         run: |
-          . .venv/bin/activate
-          PAIRS=$(python3 scripts/distribute_molecule.py --runner-index ${{ matrix.runner-index }} --max-runners 3)
-          echo "Assigned pairs: $PAIRS"
-          echo "TEST_PAIRS=$PAIRS" >> $GITHUB_ENV
-      - name: Run molecule tests
-        run: |
-          set -e
+          set -euo pipefail
           . .venv/bin/activate
           export DOCKER_HOST="unix:///run/user/$(id -u)/docker.sock"
           export ANSIBLE_INJECT_INVOCATION=1
           cd ansible/roles/gitea-runner
-          for pair in $TEST_PAIRS; do
-            IFS='|' read -r scenario platform_name platform_image platform_command <<< "$pair"
-            export MOLECULE_PLATFORM_NAME="$platform_name"
-            export MOLECULE_PLATFORM_IMAGE="$platform_image"
-            if [ -n "$platform_command" ]; then
-              export MOLECULE_PLATFORM_COMMAND="$platform_command"
-            else
-              unset MOLECULE_PLATFORM_COMMAND
-            fi
-            echo "::group::Molecule: $scenario on $platform_name"
-            if [ "$scenario" = "default" ]; then
+          for s in default multi-instance lifecycle template-content deregister update; do
+            export MOLECULE_PLATFORM_NAME="ubuntu-2204"
+            export MOLECULE_PLATFORM_IMAGE="geerlingguy/docker-ubuntu2204-ansible:latest"
+            export MOLECULE_PLATFORM_COMMAND="/lib/systemd/systemd"
+            echo "::group::Molecule: $s on ubuntu-2204"
+            if [ "$s" = "default" ]; then
               ANSIBLE_ALLOW_BROKEN_CONDITIONALS=true molecule test
             else
-              ANSIBLE_ALLOW_BROKEN_CONDITIONALS=true molecule test -s "$scenario"
+              ANSIBLE_ALLOW_BROKEN_CONDITIONALS=true molecule test -s "$s"
             fi
             echo "::endgroup::"
           done