Fixing the Flake Update Job

The flake update job currently runs, but the commits it produces do not end up in the repository. I'm trying to fix this.

.gitlab-ci.yml

@@ -6,10 +6,7 @@ nix-flake-update:
     - git config user.email "ci@runner"
     - git config user.name "ci-runner-nix-flake-update"
     - nix flake update --commit-lock-file
-    # we have an access token in $NIX_FLAKE_UPDATE_TOKEN
-    # our remote is thus "https://gitlab-ci:$NIX_FLAKE_UPDATE_TOKEN@${CI_REPOSITORY_URL#*@}"
-    - git remote set-url origin "https://gitlab-ci:$NIX_FLAKE_UPDATE_TOKEN@${CI_REPOSITORY_URL#*@}"
-    - git push origin HEAD:$CI_COMMIT_BRANCH
+    - git push "https://gitlab-ci:${NIX_FLAKE_UPDATE_TOKEN}@git.cs.uni-paderborn.de/rbfsmi/nixos.git" HEAD:$CI_COMMIT_BRANCH
   rules:
     - if: $CI_PIPELINE_SOURCE == "schedule"
   tags: