Minimal example to publish Python package to Gitlab index using uv

.gitlab-ci.yml

```yaml [.gitlab-ci.yml]

stages:
  - deploy

variables:
  UV_VERSION: "0.8"
  PYTHON_VERSION: "3.10"
  BASE_LAYER: bookworm-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
  UV_CACHE_DIR: .uv-cache
  # Gitlab Registry
  UV_PUBLISH_URL: ${CI_API_V4_URL}/projects/${CI_PROJECT_ID}/packages/pypi/
  UV_PUBLISH_USERNAME: gitlab-ci-token
  UV_PUBLISH_PASSWORD: ${CI_JOB_TOKEN}

.uv_base:
  image: ghcr.io/astral-sh/uv:$UV_VERSION-python$PYTHON_VERSION-$BASE_LAYER
  cache:
    - key:
        files:
          - uv.lock
    - paths:
        - $UV_CACHE_DIR
  after_script:
    - uv cache prune --ci

publish:
  stage: deploy
  rules:
    - if: $CI_COMMIT_TAG                                # Run for all tagged commits
  extends: .uv_base
  script:
    - uv build
    - uv publish