Issue #1102 - Add config to explicitly enable loading all github groups

Documentation/connectors/github.md

@@ -45,8 +45,8 @@ connectors:
     # If orgs are specified in the config then user MUST be a member of at least one of the specified orgs to
     # authenticate with dex.
     #
-    # If neither 'org' nor 'orgs' are specified in the config then user authenticate with ALL user's Github groups.
-    # Typical use case for this setup:
+    # If neither 'org' nor 'orgs' are specified in the config and 'loadAllGroups' setting set to true then user
+    # authenticate with ALL user's Github groups. Typical use case for this setup:
     # provide read-only access to everyone and give full permissions if user has 'my-organization:admins-team' group claim.  
     orgs:
     - name: my-organization
@@ -56,6 +56,8 @@ connectors:
       teams:
       - red-team
       - blue-team
+    # Flag which indicates that all user groups and teams should be loaded.
+    loadAllGroups: false
 
     # Optional choice between 'name' (default) or 'slug'.
     #