Create symlink from GitLab UI

ZD: https://gitlab.zendesk.com/agent/tickets/14953

Description

Feature to create symlink files from the UI. Being able to also add it through the API is also desirable.
Customer has an urgent need for this.

Use Case

Lisa would like to add new vhost configuration for apache and create a symlink to it. She browses to httpd/conf/vhosts-available and creates regular file “test.redbutton.com_80.conf”.

Lisa browses to httpd/conf/vhosts-enabled and would like to create symlink with name “test.redbutton.com_80.conf”. What would point to “../vhosts-available/test.redbutton.com_80.conf” – (should work with both relative and full path whether the target file exists or not) BUT is unable to do so as there is no option to create symlink on the + dropdown to create new dir or file.

Lisa can edit existing symlinks fine. Lisa can delete existing links fine.

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What are your thoughts on this @vsizov?