netrc gem checks for permissions and drone-runner-docker creates the file with 644 permission
```
Netrc::Error:
Permission bits for '/root/.netrc' should be 0600, but are 644
```
netrc gem checks for permissions and drone-runner-docker creates the file with 644 permission
```
Netrc::Error:
Permission bits for '/root/.netrc' should be 0600, but are 644
```