install python for setup image, accept args for build_arm script

setup/Dockerfile

@@ -1,11 +1,12 @@
-FROM python:3-alpine
+ARG DISTRO=alpine:3.8
+FROM $DISTRO
 
 RUN mkdir -p /app
 WORKDIR /app
 
 COPY requirements.txt requirements.txt
-RUN apk add --no-cache curl \
- && pip install -r requirements.txt
+RUN apk add --no-cache curl python3 py3-pip
+RUN pip3 install -r requirements.txt
 
 COPY server.py ./server.py
 COPY main.py ./main.py

tests/build_arm.sh

@@ -6,4 +6,4 @@ QEMU="$(which qemu-arm-static)"
 cp $QEMU ../webmails/rainloop/
 cp $QEMU ../webmails/roundcube/
 
-docker-compose -f build.yml build --build-arg DISTRO=$DISTRO --build-arg PHP_DISTRO=$PHP # --parallel
+docker-compose -f build.yml build --build-arg DISTRO=$DISTRO --build-arg PHP_DISTRO=$PHP $@  # --parallel