ci: enable experimental flake features

.gitlab-ci.yml

@@ -1,10 +1,12 @@
+workflow:
+  rules:
+    - if: '$CI_PIPELINE_SOURCE == "schedule"'
+
 Update Flake.nix:
   image: nixos/nix:latest
   script:
     - git config user.email "snowflake@caspervk.net"
     - git config user.name "snowflake"
-    - nix flake update --commit-lock-file
+    - nix --extra-experimental-features nix-command --extra-experimental-features flakes flake update --commit-lock-file
     - git remote add origin https://oauth2:$ACCESS_TOKEN@gitlab.com/$CI_PROJECT_PATH_SLUG
     - git push origin HEAD:$CI_COMMIT_BRANCH
-  rules:
-    - if: '$CI_PIPELINE_SOURCE == "schedule"'