fix: op not permitted in self-hosted runner (#359)

In self hosted runners in fedora with SELinux enabled,
it sometimes gives a random error
```
Error: lsetxattr /var/run/docker.sock: operation not permitted

Error: The process '/usr/bin/docker' failed with exit code 126
```

This seems to happen with docker.sock which is a link to
/run/podman/podman.sock
looks like lsetxattr is broken for links.

src/model/docker.ts

@@ -52,7 +52,7 @@ class Docker {
         return `--env UNITY_SERIAL \
                 --env GITHUB_WORKSPACE=/github/workspace \
                 ${sshAgent ? '--env SSH_AUTH_SOCK=/ssh-agent' : ''} \
-                --volume "/var/run/docker.sock":"/var/run/docker.sock:z" \
+                --volume "/var/run/docker.sock":"/var/run/docker.sock" \
                 --volume "${githubHome}":"/root:z" \
                 --volume "${githubWorkflow}":"/github/workflow:z" \
                 --volume "${workspace}":"/github/workspace:z" \