Use Alpine linux for smaller image

Dockerfile

@@ -1,21 +1,18 @@
-FROM python:latest
+FROM alpine:latest
 WORKDIR /app
 
-RUN apt-get update
-RUN apt-get install -y openjdk-11-jre
-
 RUN mkdir -p /opt/utils
 RUN wget -O /opt/utils/closure.jar "https://repo1.maven.org/maven2/com/google/javascript/closure-compiler/v20200830/closure-compiler-v20200830.jar"
 RUN wget -O /opt/utils/yuicompressor.jar "https://github.com/yui/yuicompressor/releases/download/v2.4.8/yuicompressor-2.4.8.jar"
 
-RUN pip install virtualenv
+RUN apk add --update bash python3 uwsgi uwsgi-python; python3 -m ensurepip
+
+RUN echo "www-data:x:33:33:www-data:/var/www:/usr/sbin/nologin" >> /etc/passwd; echo "www-data:x:33:" >> /etc/group
 RUN chown www-data:www-data . -R
 
+RUN pip3 install Flask redis compressinja Celery
 USER www-data
 
-RUN virtualenv env
-RUN env/bin/pip install Flask redis compressinja Celery uwsgi
-
 EXPOSE 5000
 ENTRYPOINT ["setup/docker.start"]