feat: actions: add LXC backend example (#520)

Without such an example, there is no test that would verify a modification of the ACT LXC backend is working when running a cascading pull request.

Trace of the run at: https://code.forgejo.org/forgejo/end-to-end/actions/runs/2433/jobs/2#jobstep-4-28

Reviewed-on: https://code.forgejo.org/forgejo/end-to-end/pulls/520
Reviewed-by: Michael Kriese <michael.kriese@gmx.de>
Co-authored-by: Earl Warren <contact@earl-warren.org>
Co-committed-by: Earl Warren <contact@earl-warren.org>

actions/actions.sh

@@ -143,7 +143,7 @@ function test_actions() {
             done
         fi
 
-        for example in echo config-options cache checkout service container expression local-action docker-action if if-fail push tag push-cancel artifacts pull-request context; do
+        for example in echo lxc config-options cache checkout service container expression local-action docker-action if if-fail push tag push-cancel artifacts pull-request context; do
             run actions_verify_example $example
         done
 

actions/example-lxc/.forgejo/workflows/test.yml

@@ -0,0 +1,7 @@
+on: [push]
+
+jobs:
+  build:
+    runs-on: lxc
+    steps:
+      - run: systemctl --no-pager list-units

actions/example-lxc/runner-config.yaml

@@ -0,0 +1,31 @@
+
+log:
+  level: debug
+  job_level: debug
+
+runner:
+  file: .runner
+  capacity: 1
+  env_file: .env
+  timeout: 3h
+  insecure: false
+  fetch_timeout: 5s
+  fetch_interval: 2s
+  labels: ["lxc:lxc://debian:bookworm:docker"]
+
+cache:
+  enabled: false
+  dir: ""
+  host: ""
+  port: 0
+
+container:
+  network: "bridge"
+  privileged: false
+  options:
+  workdir_parent:
+  valid_volumes: ["/srv/example"]
+  docker_host: ""
+
+host:
+  workdir_parent:

actions/example-lxc/setup.sh

@@ -0,0 +1 @@
+FORGEJO_RUNNER_CONFIG=$EXAMPLE_DIR/runner-config.yaml forgejo-runner.sh reload

actions/example-lxc/teardown.sh

@@ -0,0 +1 @@
+forgejo-runner.sh reload