gitlab_runner: Update for changed volume pruning behavior in Docker 23.0

"docker system prune --volumes" does no longer prune named volumes in
Docker 23.0[1][2], so use "docker volume prune --all"[3] for pruning
named volumes.

[1] docker/cli#4028
[2] moby/moby#44259
[3] docker/cli#4229

roles/gitlab_runner/files/gitlab-runner-docker-cleanup.service

@@ -3,5 +3,6 @@ Description=Cleanup containers, images and volumes produced by GitLab Runner
 
 [Service]
 Type=oneshot
-ExecStart=docker system prune --force --filter label=com.gitlab.gitlab-runner.managed=true --volumes
+ExecStart=docker system prune --force --filter label=com.gitlab.gitlab-runner.managed=true
+ExecStart=docker volume prune --all --force --filter label=com.gitlab.gitlab-runner.managed=true
 ExecStart=docker image prune --all --force --filter until=168h