building requirements in dockerfile

src/data-hub/community-detection-microservice/Dockerfile

@@ -5,13 +5,12 @@ ENV http_proxy http://proxy.uni-klu.ac.at:3128/
 ENV https_proxy http://proxy.uni-klu.ac.at:3128/
 
 RUN apt-get update
-RUN pip install flask
-RUN pip install connexion[swagger-ui]
 
 EXPOSE 5000
 
 WORKDIR /app
 COPY src/data-hub/community-detection-microservice/app/ /app/
+RUN pip install -r requirements.txt
 RUN chmod a+x main.py
 
 CMD ["python", "./main.py"]
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