Add source repo url to ci config

.gitlab-ci.yml

@@ -8,3 +8,6 @@ variables:
   # Must be in the format of X.Y.Z, i.e. should match /\A\d+\.\d+\.\d+\z/ regular expresion.
   # See https://docs.gitlab.com/ee/user/packages/generic_packages/#publish-a-package-file
   ARCH: 'armhf'
+  SOURCE_REPO_URL: 'https://github.com/zynthbox/plasma-framework-zynthbox'
+  SOURCE_REPO_BRANCH: ''
+  SOURCE_REPO_COMMIT_HASH: ''