[FEATURE] RPi Arm V7 & 8 Docker support revisited

Dockerfile

@@ -1,9 +1,9 @@
 FROM node:lts-alpine
 
 # Define some ENV Vars
-ENV PORT 80
-ENV DIRECTORY /app
-ENV IS_DOCKER true
+ENV PORT=80 \
+ DIRECTORY=/app \
+ IS_DOCKER=true
 
 # Create and set the working directory
 WORKDIR ${DIRECTORY}

Dockerfile-arm32v7

@@ -0,0 +1,43 @@
+FROM alpine:3.12 AS builder
+
+# Download QEMU, see https://github.com/docker/hub-feedback/issues/1261
+RUN QEMU_URL=https://github.com/balena-io/qemu/releases/download/v5.2.0%2Bbalena4/qemu-5.2.0.balena4-arm.tar.gz \
+ && apk add curl && curl -L $QEMU_URL | tar zxvf - -C . --strip-components 1
+
+# Start second (arm32v7) stage
+FROM arm32v7/alpine:3.12
+
+# Add QEMU from build stage
+COPY --from=builder qemu-arm-static /usr/bin
+
+# Install Node and Yarn
+RUN apk add --update --no-cache nodejs npm yarn
+
+# Define some ENV Vars
+ENV PORT=80 \
+ DIRECTORY=/app \
+ IS_DOCKER=true
+
+# Create and set the working directory
+WORKDIR ${DIRECTORY}
+
+# Copy over both 'package.json' and 'package-lock.json' (if available)
+COPY package*.json ./
+
+# Install project dependencies
+RUN yarn
+
+# Copy over all project files and folders to the working directory
+COPY . .
+
+# Build initial app for production
+RUN yarn build
+
+# Expose given port
+EXPOSE ${PORT}
+
+# Finally, run start command to serve up the built application
+CMD [ "yarn", "build-and-start"]
+
+# Run simple healthchecks every 5 mins, to check the Dashy's everythings great
+HEALTHCHECK --interval=5m --timeout=2s --start-period=30s CMD yarn health-check

Dockerfile-arm64v8

@@ -0,0 +1,43 @@
+FROM alpine:3.12 AS builder
+
+# Download QEMU, see https://github.com/docker/hub-feedback/issues/1261
+RUN QEMU_URL=https://github.com/balena-io/qemu/releases/download/v5.2.0%2Bbalena4/qemu-5.2.0.balena4-arm.tar.gz \
+ && apk add curl && curl -L $QEMU_URL | tar zxvf - -C . --strip-components 1
+
+# Start second (arm64v8) stage
+FROM arm64v8/alpine:3.12
+
+# Add QEMU from build stage
+COPY --from=builder qemu-arm-static /usr/bin
+
+# Install Node and Yarn
+RUN apk add --update --no-cache nodejs npm yarn
+
+# Define some ENV Vars
+ENV PORT=80 \
+ DIRECTORY=/app \
+ IS_DOCKER=true
+
+# Create and set the working directory
+WORKDIR ${DIRECTORY}
+
+# Copy over both 'package.json' and 'package-lock.json' (if available)
+COPY package*.json ./
+
+# Install project dependencies
+RUN yarn
+
+# Copy over all project files and folders to the working directory
+COPY . .
+
+# Build initial app for production
+RUN yarn build
+
+# Expose given port
+EXPOSE ${PORT}
+
+# Finally, run start command to serve up the built application
+CMD [ "yarn", "build-and-start"]
+
+# Run simple healthchecks every 5 mins, to check the Dashy's everythings great
+HEALTHCHECK --interval=5m --timeout=2s --start-period=30s CMD yarn health-check

hooks/pre-build

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+# Source: https://github.com/ckulka/docker-multi-arch-example/blob/master/hooks/pre_build
+# Used to setup QEMU to build arm images on amd64 processors.
+
+# Register qemu-*-static for all supported processors except the
+# current one, but also remove all registered binfmt_misc before
+docker run --rm --privileged multiarch/qemu-user-static:register --reset