Update .gitlab-ci.yml

.gitlab-ci.yml

@@ -8,6 +8,7 @@ Build Docker image:
   only:
     changes:
       - Dockerfile.ci
+      - requirements.txt
     refs:
       - master
     variables:
@@ -26,10 +27,6 @@ Download and generate data:
   except:
     - pushes
   image: $CI_REGISTRY_IMAGE:latest
-  before_script:
-    - "[ -f requirements.txt ] && pip3 install --requirement requirements.txt"
-    - apt --yes update
-    - apt --yes install wget csvkit sed
   script:
     - ./download_and_prepare_data
     - ./process_and_generate