Revert "use static maven-url"

This reverts commit 8d72571d.

project.clj

@@ -4,7 +4,7 @@
   :license {:name "Eclipse Public License"
             :url "http://www.eclipse.org/legal/epl-v10.html"}
   :deploy-repositories [["internal"
-                         {:url "https://git.fh-muenster.de/api/v4/projects/1862/packages/maven"
+                         {:url :env/CI_URL
                           :username "Job-Token"
                           :password :env/CI_JOB_TOKEN
                           :sign-releases false}]]