Merge pull request saleor#5912 from patrys/faster-docker-rebuild

Reorder Dockerfile commands to cache as many layers as possible

Dockerfile

@@ -15,9 +15,6 @@ RUN pip install -r requirements_dev.txt
 ### Final image
 FROM python:3.8-slim
 
-ARG STATIC_URL
-ENV STATIC_URL ${STATIC_URL:-/static/}
-
 RUN groupadd -r saleor && useradd -r -g saleor saleor
 
 RUN apt-get update \
@@ -33,16 +30,18 @@ RUN apt-get update \
   && apt-get clean \
   && rm -rf /var/lib/apt/lists/*
 
-COPY . /app
+RUN mkdir -p /app/media /app/static \
+  && chown -R saleor:saleor /app/
+
 COPY --from=build-python /usr/local/lib/python3.8/site-packages/ /usr/local/lib/python3.8/site-packages/
 COPY --from=build-python /usr/local/bin/ /usr/local/bin/
+COPY . /app
 WORKDIR /app
 
+ARG STATIC_URL
+ENV STATIC_URL ${STATIC_URL:-/static/}
 RUN SECRET_KEY=dummy STATIC_URL=${STATIC_URL} python3 manage.py collectstatic --no-input
 
-RUN mkdir -p /app/media /app/static \
-  && chown -R saleor:saleor /app/
-
 EXPOSE 8000
 ENV PORT 8000
 ENV PYTHONUNBUFFERED 1