Install build essentials on CI for mypi installation

.gitlab-ci.yml

@@ -13,6 +13,7 @@ stages:
     - ls
     - python -V
     - pip -V
+    - sudo apt install build-essential
     #- git clone https://$clone_token@gitlab.hzdr.de/hmc/hmc/cct-1-mapping/category-definitions.git
     #- pip install ./category-definitions
     - pip install poetry