Mount config.yaml to pass Docker socket into job containers

compose-snippets/act_runner.yml

@@ -1,10 +1,12 @@
 # act_runner — Gitea Actions self-hosted runner
-# Deploy on Pi 5 (arrsstack). Registers at instance level — services all repos.
+# Deploy on the machine running Gitea (same host).
+# Registers at instance level — services all repos.
 #
 # Setup:
 #   1. Gitea → Site Administration → Actions → Runners → Create Runner → copy token
-#   2. echo "RUNNER_TOKEN=<token>" > .env
-#   3. docker compose up -d
+#   2. Create /srv/act-runner/config.yaml (see compose-snippets/act_runner_config.yaml)
+#   3. echo "RUNNER_TOKEN=<token>" > .env
+#   4. docker compose up -d
 
 services:
   act-runner:
@@ -15,11 +17,12 @@ services:
       - GITEA_INSTANCE_URL=https://git.thewichersfamily.com
       - GITEA_RUNNER_REGISTRATION_TOKEN=${RUNNER_TOKEN}
       - GITEA_RUNNER_NAME=homelab-pi5
-      # Maps runs-on: labels to Docker images used for job containers
       - GITEA_RUNNER_LABELS=ubuntu-latest:docker://node:20-bookworm,ubuntu-22.04:docker://node:20-bookworm
+      - CONFIG_FILE=/etc/act_runner/config.yaml
     volumes:
       - /var/run/docker.sock:/var/run/docker.sock
       - act_runner_data:/data
+      - /srv/act-runner/config.yaml:/etc/act_runner/config.yaml:ro
 
 volumes:
   act_runner_data: