[Enhancement] Docker multi-platform image

[tomtom5152]

Is your enhancement request related to a problem? Please describe.
Currently invidious provides images for amd64 and arm64 on different tags (latest and latest-arm64 respectively). This works great with simple docker/docker-compose setups but does not scale well to a cluster orchestrator such as k8s running on mixed architecture.

Describe the solution you'd like
For invidious to provide a multi-platform image for all platforms on the same tag such that an orchestrator can automatically download the correct image.

Describe alternatives you've considered
Manually assigning a specific image to a specific arch in the orchestrator. Works, but isn't ideal given it significantly hinders the ability of the orchestrator to schedule the pods across the whole cluster.

Additional context
Related #361

Would prevent issues such as #4177, #3609 with confusion about the latest/latest-arm64 tags

[unixfox]

We hear the issue but it's explained here why this is not possible as of now: #361 (comment)

We are investigating the cross compilation in this issue: #2648 though.

Closing as I prefer to keep issue #2648 dedicated for finding how to cross compile for ARM then we can think about the multi platform.