actions: parallel LXC jobs (#1149)

This is not guaranteed to fail if parallel jobs is broken, but it is likely to. That could create transient errors detecting race conditions similar to https://code.forgejo.org/forgejo/lxc-helpers/issues/50.

Reviewed-on: https://code.forgejo.org/forgejo/end-to-end/pulls/1149
Reviewed-by: Mathieu Fenniak <mfenniak@noreply.code.forgejo.org>
Co-authored-by: Earl Warren <contact@earl-warren.org>
Co-committed-by: Earl Warren <contact@earl-warren.org>

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

@@ -1,8 +1,16 @@
 on: [push]
 
 jobs:
-  build:
+  job1:
     runs-on: lxc
     steps:
       - uses: https://data.forgejo.org/actions/checkout@v4
       - run: systemctl --no-pager list-units
+  job2:
+    runs-on: lxc
+    steps:
+      - run: echo OK2
+  job3:
+    runs-on: lxc
+    steps:
+      - run: echo OK3

actions/example-lxc/runner-config.yaml

@@ -11,7 +11,7 @@ runner:
   insecure: false
   fetch_timeout: 5s
   fetch_interval: 2s
-  labels: ["lxc:lxc://debian:bookworm:docker"]
+  labels: ["lxc:lxc://debian:bookworm"]
 
 cache:
   enabled: false