Don't cache pip

Dockerfile

@@ -3,7 +3,7 @@ LABEL maintainer="admin-validata@jailbreak.paris"
 
 EXPOSE 5000
 
-RUN pip install gunicorn==19.9.0
+RUN pip install --no-cache-dir gunicorn==19.9.0
 
 RUN apt-get update && \
   apt-get install --yes chromium=73.0.3683.75-1~deb9u1
@@ -11,9 +11,9 @@ RUN apt-get update && \
 WORKDIR /app
 
 COPY requirements.txt .
-RUN pip install --requirement requirements.txt
+RUN pip install --no-cache-dir --requirement requirements.txt
 
 COPY . .
-RUN pip install --editable .
+RUN pip install --no-cache-dir --editable .
 
 CMD gunicorn --bind 0.0.0.0:5000 validata_ui:app
\ No newline at end of file