Add update version job

.gitlab-ci.yml

+stages:
+  - release
+  - deploy
+
 variables:
   UV_LINK_MODE: copy
   UV_CACHE_DIR: .uv-cache
@@ -12,6 +16,19 @@ default:
   after_script:
     - uv cache prune --ci
 
+release:
+  stage: release
+  script:
+    - apk add git
+    - uv add "mkdocs-dsfr>=${RELEASE_VERSION}"
+    - git config user.email "[email protected]"
+    - git config user.name "CI Pipeline"
+    - git add ./pyproject.toml
+    - git commit -m "Release version ${RELEASE_VERSION}"
+    - git push https://gitlab-ci-token:${PUSH_TOKEN}@${CI_SERVER_HOST}/$CI_PROJECT_PATH.git HEAD:main --push-option="ci.skip"
+  rules:
+    - if: $RELEASE_VERSION
+
 pages:
   stage: deploy
   script: