Fix traefik argument volumes

[stepri]

According to the docs you can mount volumes for the traefik with:

traefik:
  options:
    volumes:
      - /tmp/example.json:/tmp/example.json 

But it gaves the following error:

 ERROR (SSHKit::Command::Failed): Exception while executing on host 1.1.1.1: docker exit status: 125
docker stdout: Nothing written
docker stderr: unknown flag: --volumes
See 'docker run --help'.

Fixed in this PR.

[djmb]

Hi @stepri, thanks for the PR!

There's a couple of test failures here, would you be able to look into them? 🙏

2023-08-31T16:13:10.6336088Z ..F
2023-08-31T16:13:10.6336563Z 
2023-08-31T16:13:10.6337477Z Failure:
2023-08-31T16:13:10.6338014Z CommandsTraefikTest#test_run_with_several_options_configured [/home/runner/work/kamal/kamal/test/commands/traefik_test.rb:63]:
2023-08-31T16:13:10.6338752Z --- expected
2023-08-31T16:13:10.6339492Z +++ actual
2023-08-31T16:13:10.6339898Z @@ -1 +1,3 @@
2023-08-31T16:13:10.6341249Z -"docker run --name traefik --detach --restart unless-stopped --publish 80:80 --volume /var/run/docker.sock:/var/run/docker.sock --log-opt max-size=\"10m\" --volume \"./letsencrypt/acme.json:/letsencrypt/acme.json\" --publish \"8080:8080\" --memory \"512m\" traefik:test --providers.docker --log.level=\"DEBUG\" --accesslog.format=\"json\" --api.insecure --metrics.prometheus.buckets=\"0.1,0.3,1.2,5.0\""
2023-08-31T16:13:10.6342172Z +# encoding: US-ASCII
2023-08-31T16:13:10.6342389Z +#    valid: true
2023-08-31T16:13:10.6343400Z +"docker run --name traefik --detach --restart unless-stopped --publish 80:80 --volume /var/run/docker.sock:/var/run/docker.sock --log-opt max-size=\"10m\" --volumes \"./letsencrypt/acme.json:/letsencrypt/acme.json\" --publish \"8080:8080\" --memory \"512m\" traefik:test --providers.docker --log.level=\"DEBUG\" --accesslog.format=\"json\" --api.insecure --metrics.prometheus.buckets=\"0.1,0.3,1.2,5.0\""
2023-08-31T16:13:10.6344039Z 
2023-08-31T16:13:10.6344045Z 
2023-08-31T16:13:10.6344264Z bin/test home/runner/work/kamal/kamal/test/commands/traefik_test.rb:57
2023-08-31T16:13:10.6344464Z 
2023-08-31T16:13:10.6363565Z ....F
2023-08-31T16:13:10.6363742Z 
2023-08-31T16:13:10.6365222Z Failure:
2023-08-31T16:13:10.6365645Z CommandsTraefikTest#test_run_with_volumes_configured [/home/runner/work/kamal/kamal/test/commands/traefik_test.rb:52]:
2023-08-31T16:13:10.6366086Z --- expected
2023-08-31T16:13:10.6366276Z +++ actual
2023-08-31T16:13:10.6366495Z @@ -1 +1,3 @@
2023-08-31T16:13:10.6367462Z -"docker run --name traefik --detach --restart unless-stopped --publish 80:80 --volume /var/run/docker.sock:/var/run/docker.sock --log-opt max-size=\"10m\" --volume \"./letsencrypt/acme.json:/letsencrypt/acme.json\" traefik:test --providers.docker --log.level=\"DEBUG\" --accesslog.format=\"json\" --api.insecure --metrics.prometheus.buckets=\"0.1,0.3,1.2,5.0\""
2023-08-31T16:13:10.6368171Z +# encoding: US-ASCII
2023-08-31T16:13:10.6368375Z +#    valid: true
2023-08-31T16:13:10.6369327Z +"docker run --name traefik --detach --restart unless-stopped --publish 80:80 --volume /var/run/docker.sock:/var/run/docker.sock --log-opt max-size=\"10m\" --volumes \"./letsencrypt/acme.json:/letsencrypt/acme.json\" traefik:test --providers.docker --log.level=\"DEBUG\" --accesslog.format=\"json\" --api.insecure --metrics.prometheus.buckets=\"0.1,0.3,1.2,5.0\""
2023-08-31T16:13:10.6369895Z 
2023-08-31T16:13:10.6369911Z 
2023-08-31T16:13:10.6370067Z bin/test home/runner/work/kamal/kamal/test/commands/traefik_test.rb:46

[stepri]

Sorry, I was wrong. Let's update the documentation because docker expects "--volume" argument