Update Dockerfile

Little more Dockerfile cleanup

Author: bglopez

Dockerfile

@@ -4,11 +4,10 @@ COPY . /app
 RUN apk add --update --no-cache python2 py2-pip py2-gevent \
     py2-flask py2-requests py2-pygments py2-redis \
     py2-cffi py2-icu bash vim gawk sed \
-    && apk add --update --no-cache --virtual build-deps python2-dev \
+    && apk add --no-cache --virtual build-deps python2-dev \
     build-base git \
     && pip install -r requirements.txt \
     && sh share/scripts/get-sheets.sh \
-    && apk del build-deps \
-    && rm -rf /var/cache/apk/*
+    && apk del build-deps
 ENTRYPOINT ["python2"]
 CMD ["bin/srv.py"]