Update .gitlab-ci.yml file

.gitlab-ci.yml

@@ -1,10 +1,19 @@
 workflow:
   name: 'Trust Cafe API Wrapper testing pipeline'
+  
+variables:
+  UV_VERSION: "0.11.2"
+  PYTHON_VERSION: "3.12"
+  BASE_LAYER: trixie-slim
+  # GitLab CI creates a separate mountpoint for the build directory,
+  # so we need to copy instead of using hard links.
+  UV_LINK_MODE: copy
 
 stages:
   - test
 
 test:
+  image: ghcr.io/astral-sh/uv:$UV_VERSION-python$PYTHON_VERSION-$BASE_LAYER
   script:
     - uv sync
     - python unittests.py