Add support for multiarch container images (amd64/arm64)

Container images built with support for the ARM architecture
perform much better on Apple Silicon laptops.

Author: ihalaij1

Dockerfile

@@ -1,4 +1,4 @@
-FROM debian:bullseye-20221114-slim
+FROM --platform=$TARGETPLATFORM debian:bullseye-20221114-slim
 
 ENV LANG=C.UTF-8 USER=root HOME=/root
 

hooks/build

@@ -0,0 +1,10 @@
+#!/bin/sh
+
+docker run --privileged --rm tonistiigi/binfmt --install all
+
+docker buildx create --use default
+
+docker buildx build \
+--push \
+--tag "$DOCKER_REPO":"$DOCKER_TAG" \
+--platform linux/amd64,linux/arm64 .

hooks/push

@@ -0,0 +1,3 @@
+#!/bin/sh
+
+# This hook is empty because the image was pushed to the registry in the build hook