Allow multiple platforms to use docker image

[386jp]

This PR sets a platform variable in GitHub Action config for Docker image deployment.
This allows people to use Docker image in arm-based system (like Asahi Linux), in addition to the amd-based system.

[banban525]

Thank you for your PR.
However, I'm not familiar with the "platforms" option.
I'll merge it after a little research.

[banban525]

@386jp

I understand the purpose of PR.
When doing Docker pull in an Arm environment, an error occurs because arm64 is not specified.

However, reading some blogs, it seems that "docker/setup-qemu-action" is required for GitHub action to use "platforms".
The current GitHub Action script does not have "docker/setup-qemu-action", which may cause the build to fail.

[banban525]

@386jp

However, your suggestion to create a container image for arm64 is great.
I'll merge this PR and debug it myself.