Feature: gitlab service widget (#4317)

Co-authored-by: shamoon <4887959+shamoon@users.noreply.github.com>

docs/widgets/services/gitlab.md

@@ -0,0 +1,20 @@
+---
+title: Gitlab
+description: Gitlab Widget Configuration
+---
+
+Learn more about [Gitlab](https://gitlab.com).
+
+API requires a personal access token with either `read_api` or `api` permission. See the [gitlab documentation](https://docs.gitlab.com/ee/user/profile/personal_access_tokens.html#create-a-personal-access-token) for details on generating one.
+
+Your Gitlab user ID can be found on [your profile page](https://support.circleci.com/hc/en-us/articles/20761157174043-How-to-find-your-GitLab-User-ID).
+
+Allowed fields: `["events", "issues", "merges", "projects"]`.
+
+```yaml
+widget:
+  type: gitlab
+  url: http://gitlab.host.or.ip:port
+  key: personal-access-token
+  user_id: 123456
+```

docs/widgets/services/index.md

@@ -41,6 +41,7 @@ You can also find a list of all available service widgets in the sidebar navigat
 - [Gatus](gatus.md)
 - [Ghostfolio](ghostfolio.md)
 - [Gitea](gitea.md)
+- [Gitlab](gitlab.md)
 - [Glances](glances.md)
 - [Gluetun](gluetun.md)
 - [Gotify](gotify.md)