Added /gitproxy API endpoint

[enrichman]

This PR adds the /gitproxy endpoint.

This endpoint will proxy some of the Github and Gitlab APIs. If a gitconfig ID is provided then this will be used to enrich the request (with the token, or skipping the SSL verification, or custom certificates).

[codecov]

Codecov Report

Attention: 36 lines in your changes are missing coverage. Please review.

Files	Coverage Δ
internal/api/v1/router.go	100.00% <ø> (ø)
helpers/cahash/cahash.go	53.84% <0.00%> (-33.66%)	⬇️
internal/api/v1/gitproxy/gitproxy.go	87.19% <87.19%> (ø)

... and 20 files with indirect coverage changes

📢 Thoughts on this report? Let us know!.

[enrichman]

As discussed internally we need to check if there was an error regarding the Gitlab search endpoint:

https://github.com/rancher/dashboard/blob/b9180782e23fb67edb7d53dc9769c60573799434/shell/store/gitlab.js#L67-L71

This seems to point to a projects/${ repo }/repository/branches/${ branch } but it should probably be projects/${ username }%2F${ repo }/repository/branches/${ branch }.

@torchiaf is on it 👍

[enrichman]

Adding one more insight. I was trying to use the Gitlab /search/repositories API but it seems to be unknown:

• https://gitlab.com/api/v4/search/repositories?q=repo:inkscape/inkscape

{"error":"404 Not Found"}

Reading the Gitlab doc it should be just /search, but it seems to be an authenticated endpoint.

• https://gitlab.com/api/v4/search?q=repo:inkscape/inkscape

{"message":"401 Unauthorized"}

Maybe that's the reason because of the error? Maybe the search on Gitlab needs a token, and so it was not available?

By the way I'm not sure where the search API is used (Gitlab or Github). Any help about this? @richard-cox @torchiaf

[andreas-kupries]

LGTM