more Dockerfile tweaking

builder/Dockerfile

@@ -4,21 +4,12 @@ ENV SSL_CERT_FILE /etc/ssl/certs/ca-certificates.crt
 ENV BLOG_UID 1000
 ENV BLOG_GID 1000
 RUN set -ex \
- && echo "http://nl.alpinelinux.org/alpine/edge/community" >> /etc/apk/repositories \
  && apk upgrade -a --no-cache \
- && apk add --no-cache \
-        lftp \
-        make \
-        tzdata \
- && cp /usr/share/zoneinfo/Europe/Berlin /etc/localtime \
- && echo "Europe/Berlin" >  /etc/timezone \
- && apk del tzdata \
- && addgroup -g $BLOG_GID blog \
- && adduser -h /home/blog -D -s /bin/sh -G blog blog \
- && chown -R $BLOG_UID:$BLOG_GID /home/blog
-COPY requirements.txt .
+ && pip install -U pip \
+ && mkdir /wheels
+COPY requirements.txt /wheels/requirements.txt
 
-FROM base as builder
+FROM base as wheel_builder
 RUN set -ex \
  && apk add --no-cache\
         ca-certificates \
@@ -31,14 +22,24 @@ RUN set -ex \
         linux-headers \
         make \
         musl-dev \
- && pip install -r requirements.txt
+ && pip wheel -w /wheels -r /wheels/requirements.txt
 
 FROM base
-COPY --from=builder /root/.cache /root/.cache
+COPY --from=wheel_builder /wheels /wheels
 RUN set -ex \
- && pip install -r requirements.txt \
+ && pip install -r /wheels/requirements.txt -f /wheels \
  && rm -rf /root/.cache \
- && rm requirements.txt
+ && rm -rf /wheels \
+ && apk add --no-cache \
+        lftp \
+        make \
+        tzdata \
+ && cp /usr/share/zoneinfo/Europe/Berlin /etc/localtime \
+ && echo "Europe/Berlin" >  /etc/timezone \
+ && apk del tzdata \
+ && addgroup -g $BLOG_GID blog \
+ && adduser -h /home/blog -D -s /bin/sh -G blog blog \
+ && chown -R $BLOG_UID:$BLOG_GID /home/blog
 USER blog
 WORKDIR /blog
 EXPOSE 8000