Build Multi-Arch Docker Images in CI

[t83714]

ARM64 becomes a mainstream platform nowadays with M1's popularity and cloud computing offerings like AWS Graviton.

This ticket is about offering ARM64 support by building Multi-Arch (linux/amd64 & linux/arm64) Docker docker images in our CI.

As the first step, we will:

• Release all docker images as Multi-Arch universal docker images to docker hub, except:
  • magda-postgres
  • magda-elastic-search (we will build Multi-Arch universal docker images for elasticsearch as well. Using our own elasticsearch base image forked from official: https://github.com/magda-io/elasticsearch-docker)
  • We might need substantial effort for the two modules above. Thus, might be wise to wait and see if upstream ARM64 will be available.
• Release a test release

[t83714]

closed via #3264