ci: Try to use CI variables

Author: fischeti

.gitlab-ci.yml

@@ -17,6 +17,7 @@ stages:
     - source iis-env.sh
     # Hard link cached python packages since the UV cache directory
     # is configured to be on the same filesystem as the build directory in the CI.
+    - export UV_CACHE_DIR=$CI_BUILDS_DIR/../cache/uv
     - export UV_LINK_MODE=hardlink
 
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.gitlab/common.yml

@@ -5,7 +5,6 @@
 variables:
   PD_COMMIT: "uv" # TODO: Use actual commit
   SPU_COMMIT: "c2e8815487bd713624d74ef3e3e0465196b6d67f"
-  UV_CACHE_DIR: $CI_BUILDS_DIR/../cache/uv
 
 # Check the cache for bender and python dependencies
 .cache-deps: