fix: mount Docker socket into job containers via runner container options

Job containers need access to the host Docker socket to run docker
build/push commands. Adding -v /var/run/docker.sock:/var/run/docker.sock
to container options so docker CLI in job containers can reach the
host Docker daemon.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/forgejo-runner/forgejo-runner-config.yaml

@@ -20,4 +20,4 @@ data:
     container:
       network: host
       privileged: false
-      options:
+      options: -v /var/run/docker.sock:/var/run/docker.sock