arm32v7 docker build setup (#97)

Dockerfile.arm32v7

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+FROM alpine AS builder
+
+ENV QEMU_URL https://github.com/balena-io/qemu/releases/download/v3.0.0%2Bresin/qemu-3.0.0+resin-arm.tar.gz
+RUN apk add curl && curl -L ${QEMU_URL} | tar zxvf - -C . --strip-components 1
+
+FROM arm32v7/alpine:3.9
+
+COPY --from=builder qemu-arm-static /usr/bin
+RUN mkdir application
+WORKDIR /application
+ADD . /application
+
+RUN apk add --no-cache tzdata python3 git bluez glib-dev make bluez-dev bluez-libs musl-dev linux-headers gcc grep && \
+    python3 -m ensurepip && \
+    rm -r /usr/lib/python*/ensurepip && \
+    pip3 install --upgrade pip setuptools && \
+    if [ ! -e /usr/bin/pip ]; then \
+      ln -s pip3 /usr/bin/pip ; \
+    fi && \
+    if [[ ! -e /usr/bin/python ]]; then \
+      ln -sf /usr/bin/python3 /usr/bin/python; \
+    fi && \
+    rm -r /root/.cache && \
+    mkdir /config && \
+    pip install -r requirements.txt && \
+    ln -s /config/config.yaml ./config.yaml && \
+    apk del --no-cache bluez-dev musl-dev gcc make git glib-dev linux-headers grep python2
+
+RUN apk add --no-cache tzdata python3 git bluez glib-dev make bluez-dev bluez-libs musl-dev linux-headers gcc grep && \
+    grep -P "(?<=REQUIREMENTS).*" workers/*.py | grep -Po "(?<=\[).*(?=\])" | tr ',' '\n' | tr "'" " "| tr "\"" " " > /tmp/requirements.txt && \
+    cat /tmp/requirements.txt && \
+    pip install -r /tmp/requirements.txt && \
+    rm /tmp/requirements.txt && \
+    apk del --no-cache bluez-dev musl-dev gcc make git glib-dev linux-headers grep python2
+
+ADD ./start.sh /start.sh
+RUN chmod +x /start.sh
+
+ENV DEBUG false
+
+VOLUME ["/config"]
+
+ENTRYPOINT ["/bin/sh", "-c", "/start.sh"]

hooks/post_push

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+#!/bin/bash
+
+curl -Lo manifest-tool https://github.com/estesp/manifest-tool/releases/download/v0.9.0/manifest-tool-linux-amd64
+chmod +x manifest-tool
+
+./manifest-tool push from-spec multi-arch-manifest.yaml

hooks/pre_build

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+#!/bin/bash
+
+docker run --rm --privileged multiarch/qemu-user-static:register --reset

multi-arch-manifest.yaml

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+image: zewelor/bt-mqtt-gateway:latest
+manifests:
+  - image: zewelor/bt-mqtt-gateway:amd64
+    platform:
+      architecture: amd64
+      os: linux
+  - image: zewelor/bt-mqtt-gateway:arm32v7
+    platform:
+      architecture: arm
+      os: linux
+      variant: v7