Feature/gitlab deploykey updkey (#1661)

* feat(gitlab-deploy-key): automatically update ...

... the public key

* add integrity test

* fix sanity issues

* added changelog fragment

Co-authored-by: Mirko Wilhelmi <Mirko.Wilhelmi@sma.de>

plugins/modules/source_control/gitlab/gitlab_deploy_key.py

@@ -145,6 +145,13 @@ class GitLabDeployKey(object):
     def createOrUpdateDeployKey(self, project, key_title, key_key, options):
         changed = False
 
+        # note: unfortunately public key cannot be updated directly by
+        #   GitLab REST API, so for that case we need to delete and
+        #   than recreate the key
+        if self.deployKeyObject and self.deployKeyObject.key != key_key:
+            self.deployKeyObject.delete()
+            self.deployKeyObject = None
+
         # Because we have already call existsDeployKey in main()
         if self.deployKeyObject is None:
             deployKey = self.createDeployKey(project, {