Support for arm64 architecture

[fvasco]

Please add support for arm64 architecture to docker images.

It is possible to create docker images supporting both amd64 and arm64 using buildx:

docker buildx build \
  --build-arg BUILD_AUTHORS="Kane 'kawaii' Valentine <[email protected]>" \
  --build-arg BUILD_DATE=$(date -u +'%Y-%m-%dT%H:%M:%SZ') \
  --build-arg BUILD_SHA512SUM=be3bdec9617050abbabbfcfa40e9cd145db3a57ae70e740bc62d807b04c08a5fa42ac690a5502c344f0f7452276aa0f3802501e6d62fa76edc64ac36da25b3cd \
  --build-arg BUILD_VERSION=1830 \
  --platform linux/arm64/v8,linux/amd64 \
  --tag mybb/mybb:1.8 \
  --tag mybb/mybb:1.8.30 \
  --tag mybb/mybb:latest \
  $PWD

Add the --push option to upload images.

[LZeugirdor]

This ^
Would like to run this on my raspberry pi 4 lol.