remove dependencies

.gitlab-ci.yml

@@ -10,7 +10,6 @@ test-style:
   stage: test
   needs: []
   script:
-  - apt update && apt install -y apache2-dev graphviz graphviz-dev
   - cd ippisite
   - pip install flake8
   - flake8 --config=.flake8
@@ -110,4 +109,4 @@ build-ippisite:
   needs: []
   extends: .build
   before_script:
-    - cd ippisite
+    - cd ippisite
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