Build official ARM64 Docker images

Just for reference, this is the output on a mac M1 when pulling and running:

WARNING: The requested image's platform (linux/amd64) does not match the detected host platform (linux/arm64/v8) and no specific platform was requested
Attempting: apache2-foreground
[Thu May 25 16:44:55.354085 2023] [mpm_prefork:notice] [pid 1] AH00163: Apache/2.4.56 (Debian) configured -- resuming normal operations
[Thu May 25 16:44:55.361846 2023] [core:notice] [pid 1] AH00094: Command line: 'apache2 -D FOREGROUND'
[Thu May 25 16:45:02.602490 2023] [mpm_prefork:notice] [pid 1] AH00170: caught SIGWINCH, shutting down gracefully

Seems that when doing dockerx, you can "tag" the platform of the image, so I could test when it's published for arm64 https://docs.docker.com/build/building/multi-platform/

@Symbioquine's pull request implements this! https://github.com/farmOS/farmOS/pull/864

This will be released with v3.3.0 of farmOS!

Automatically closed - issue fixed for 2 weeks with no activity.