Add documentation for private go packages

GitLab projects can be used as go packages, but in order to use a private project a .netrc file needs to be used for authentication. This is really by curl feature used by go get but we should document this somewhere.

https://ec.haxx.se/usingcurl-netrc.html

Follow-up from https://gitlab.com/gitlab-org/gitlab-ce/issues/45055

New doc or update?

• New documentation
• Update existing documentation

Checklists

Product Manager

• Add the correct labels
• Add the correct milestone
• Indicate the correct document/directory for this feature
• Fill the doc blurb below

Documentation blurb

• Doc title

• Feature overview/description

• Feature use cases

Developer

• Copy the doc blurb above and paste it into the doc
• Write the tutorial - explain how to use the feature
• Submit the MR using the appropriate MR description template

changed milestone to %Backlog

added Create [DEPRECATED] documentation repository labels

mentioned in merge request gitlab-com/www-gitlab-com!17766 (merged)

@marcia I'm not sure where the docs for this feature is best to go – it was suggested we document this better by @eread in the release post gitlab-com/www-gitlab-com!17766 (comment 131914728)

@jramsay sorry, I'm having trouble with my Mac, couldn't load the release post MR. But if I understood correctly, this is part of our repositories? If so, we could add a section here: https://docs.gitlab.com/ee/user/project/repository/. If it's not repo/file-related, then I guess it's project-related, in which case, we should add it here: https://docs.gitlab.com/ee/user/project/.

WDYT?

assigned to @jramsay and unassigned @marcia

@marcia The comment was regarding this part: https://release-11-7.about-src.gitlab.com/2019/01/22/gitlab-11-7-released/#support-for-private-go-packages-in-subgroups.

I just wondered if we needed anything, anywhere about that.

As @jramsay says, it's actually a curl feature, not a feature of GitLab, so I'm not sure.

I thought for this we could just add a note somewhere. Something like:

NOTE: **Note:**
Any project can be used as a Go package including private projects in subgroups.

To use packages hosted in private projects with the `go get` command, use a `.netrc` file and a personal access token in the password field.

CC @axil.

mentioned in merge request !24477 (merged)

How about this, just to help our customers about this feature: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/24477.

I left a comment in the MR :)

changed milestone to %11.7

closed via merge request !24477 (merged)

mentioned in commit 1914f3c4

mentioned in commit 481532c8

added devopscreate label