Document relative url support

• Omnibus https://gitlab.com/gitlab-org/omnibus-gitlab/merge_requests/590

Source

Workhorse:

• in /etc/default/gitlab if the default init system is used

• in gitlab-recipes if other init is used (ie. systemd)

• In application.rb set: config.relative_url_root = "/gitlab"

• In gitlab.yml set: relative_url_root: /gitlab

• In unicorn.rb set: ENV['RAILS_RELATIVE_URL_ROOT'] = "/gitlab"

• In ../gitlab-shell/config.yml set: gitlab_url: "http://127.0.0.1/gitlab"

• Remove the 5th step in application.rb and link to docs once ready.

QA

Test with both NGINX/Apache:

• git push/pull https
• git push/pull ssh
• Download zip/gz files
• CI/Runner is functional

mentioned in issue #1938 (closed)

mentioned in issue #13198 (closed)

Marked the task In application.rb set: config.relative_url_root = "/gitlab" as completed

Marked the task in /etc/default/gitlab if the default init system is used as completed

Marked the task In gitlab.yml set: relative_url_root: /gitlab as completed

Marked the task In ../gitlab-shell/config.yml set: gitlab_url: "http://127.0.0.1/gitlab" as completed

Marked the task In unicorn.rb set: ENV['RAILS_RELATIVE_URL_ROOT'] = "/gitlab" as completed

Marked the task Remove the 5th step in application.rb and link to docs once ready. as completed

mentioned in merge request !2770 (merged)

Marked the task in gitlab-recipes if other init is used (ie. systemd) as completed

Status changed to closed by merge request !2770 (merged)

mentioned in commit 10aa99a3