Added a .gitlab-ci.yml

and included the copyright notice for .kde-ci.yml into the file itself

.gitlab-ci.yml

+# SPDX-FileCopyrightText: none
+#
+# SPDX-License-Identifier: CC0-1.0
+
+include:
+  - https://invent.kde.org/sysadmin/ci-utilities/raw/master/gitlab-templates/linux.yml

.kde-ci.yml

+# SPDX-FileCopyrightText: none
+#
+# SPDX-License-Identifier: CC0-1.0
+
 Dependencies:
 - 'on': '@all'
   'require':

.kde-ci.yml.license

-SPDX-FileCopyrightText: none
-
-SPDX-License-Identifier: CC0-1.0