fix(cache): expose embedded cache to job containers via host

act_runner's defaults autodetect its own container IP as the cache
host, which per-job networks can't route to — every actions/cache
restore and save hit a 5-minute ETIMEDOUT. Add a config.yaml that
pins the cache port and advertises host.docker.internal, publish
that port on the host, and inject --add-host=host-gateway into
job containers so the hostname resolves inside isolated networks.

config.yaml

@@ -0,0 +1,8 @@
+cache:
+  enabled: true
+  dir: "/data/cache"
+  host: "host.docker.internal"
+  port: 42951
+
+container:
+  options: "--add-host=host.docker.internal:host-gateway"

docker-compose.yml

@@ -6,9 +6,13 @@ services:
       GITEA_INSTANCE_URL: "https://git.apoena.dev"
       GITEA_RUNNER_REGISTRATION_TOKEN: "${GITEA_RUNNER_REGISTRATION_TOKEN}"
       GITEA_RUNNER_NAME: "coolify-runner"
+      CONFIG_FILE: "/config/config.yaml"
+    ports:
+      - "42951:42951"
     volumes:
       - /var/run/docker.sock:/var/run/docker.sock
       - runner_data:/data
+      - ./config.yaml:/config/config.yaml:ro
 
 volumes:
   runner_data: