Add gitlab support

[thrix]

People are looking for this, I do not see an issue for it but I know it is planned.

[lachmanfrantisek]

• packit-as-a-tool is ready
• We need to investigate, what is needed to have a "gitlab-app" (or what is the workflow there).
  • Are just webhooks enough?
  • Is it worth it? / Is it a priority for us? / How many projects will use it?
  • How much time it will take us to implement it? How much code we can share with github?
  • GitHub and GitLab have different API and workflow: what would be the best way to interact with GitLab?
  • How can we support custom instances, not just gitlab.com?

[TomasTomecek]

* [x]  packit-as-a-tool is ready

Even the code which parses origin remote url?

  * Are just webhooks enough?
  * Is it worth it? / Is it a priority for us? / How many projects will use it?
  * How much time it will take to us? How much code we can share with github?

+1

will add more to your list

[lachmanfrantisek]

Even the code which parses origin remote url?

It 'should' work as well.