feat(devops): Add model tag attribute to model

ref: #773 #515 #576

app/devops/models/git_group.py

@@ -17,6 +17,8 @@ class GitGroup(
 
     documentation = ''
 
+    model_tag = 'git_group'
+
     page_layout: dict = [
         {
             "name": "Details",

docs/projects/centurion_erp/user/core/markdown.md

@@ -83,6 +83,7 @@ A Model link is a reference to an item within the database. Supported model link
 | externallink| `$-<id>` |
 | featureflag| `$feature_flag-<id>` |
 | gitrepository| `$git_repository-<id>` |
+| gitgroup| `$git_group-<id>` |
 | group| `$-<id>` |
 | it_asset | `$it_asset-<id>` |
 | knowledgebase| `$kb-<id>` |