Validate maintainers in GitLab runners

[alvgarvilla]

BUG REPORT

Version of Helm and Kubernetes:
Helm v2.12.3
Kubernetes v1.11.7

What happened:

For validating the maintainers it sends a HEAD request to the URL built like: repoUrl/maintainerName.

repoUrl is obtained through the following command:

git ls-remote --get-url origin

In most of the cases, if you run it the output for GitLab would be something like:

https://gitlab.com/my-nice-group/MyNiceProject.git

Which matches perfectly with the regex expression defined in https://github.com/helm/chart-testing/blob/master/pkg/tool/account.go#L27

But if you run that command in a GitLab runner, the output would be:

https://gitlab-ci-token:[MASKED]@gitlab.com/my-nice-group/MyNiceProject.git

So the validation will always fail with the following error:

Error validating maintainers: Head https://gitlab-ci-token/garcal01: dial tcp: lookup gitlab-ci-token on 192.168.0.10:53: server misbehaving

What you expected to happen:
regex expression also matches GitLab runner output

How to reproduce it (as minimally and precisely as possible):
Use helm/chart-testing tool in a GitLab runner validating maintainers

[unguiculus]

Thanks for reporting this. Would you mind submitting a PR to fix this?