fix: update gitea-runner to use Unix socket for Docker

- Changed DOCKER_HOST from tcp://localhost:2375 to unix:///var/run/docker.sock
- Updated docker_host in container config
- Fixed runner to use Unix socket instead of TCP/TLS

k8s/base/gitea-runner-config.yaml

@@ -9,7 +9,7 @@ data:
       level: info
     runner:
       file: .runner
-      capacity: 1
+      capacity: 2
       timeout: 3h
       fetch_timeout: 5s
       fetch_interval: 2s
@@ -18,7 +18,7 @@ data:
         - "ubuntu-24.04:docker://docker.gitea.com/runner-images:ubuntu-24.04"
         - "ubuntu-22.04:docker://docker.gitea.com/runner-images:ubuntu-22.04"
       envs:
-        DOCKER_HOST: "tcp://localhost:2375"
+        DOCKER_HOST: "unix:///var/run/docker.sock"
     cache:
       enabled: true
       dir: ""
@@ -27,5 +27,5 @@ data:
     container:
       privileged: true
       network: host
-      docker_host: "tcp://localhost:2375"
+      docker_host: "unix:///var/run/docker.sock"
       force_pull: true