Add gitlab project id to defined variable

[mikhatanu]

What feature do you want to see added?

Gitlab webhook sends post request that contains "project_id". Currently, this is not mapped to a defined variable. This can be useful when repository are trying to call gitlab's api, for example when uploading generic package.

Upstream changes

No response

Are you interested in contributing this feature?

No response

[Aditya-PS-05]

@mikhatanu , I am interested to solve it. Can you assign me this issue?

[krisstern]

Hi @Aditya-PS-05 we do not assign issues but you are welcome to work on this via a PR