get version from release tag instead of manually

.gitlab-ci.yml

@@ -42,6 +42,7 @@ build_package:
   stage: build
   script:
     - pip install -r requirements.txt
+    - sed -i "s_VERSION_0.0.1_g" setup.cfg
     - python -m build
   artifacts:
     paths:
@@ -55,4 +56,6 @@ publish_package:
   stage: publish
   script:
     - pip install twine
+    - VER=${CI_COMMIT_TAG#*-}
+    - sed -i "s_VERSION_${VER}_g" setup.cfg
     - TWINE_PASSWORD=${CI_JOB_TOKEN} TWINE_USERNAME=gitlab-ci-token python -m twine upload --repository-url ${CI_API_V4_URL}/projects/${CI_PROJECT_ID}/packages/pypi dist/*

setup.cfg

 [metadata]
 name = airflow_datacat_integration
-version = 0.0.1
+version = VERSION
 author = Christian Boettcher
 author_email = c.boettcher@fz-juelich.de
 description = Datacatalog Integration for Apache Airflow