Use pre-built Docker image for erd

[felixvanoost]

Replaces the kroki-builder-erd Docker image used to build the erd binary with a pre-built image published upstream. This resolves the issue with using erd on ARM64 machines described in #1239 and #1084, and should slightly reduce the build time of the Kroki Docker images.

The maintainer of https://github.com/BurntSushi/erd merged my PR to publish a linux/arm64 Docker image in October 2023 but didn't complete setting up the required ARM64 runner. There's been no further progress since then, so I've created a fork of the project and published the images myself.

@ggrossetie I'm happy to transfer ownership of the fork to you if you'd like to maintain control over it.

Closes #1239
Closes #1084

[ggrossetie]

Hey! thanks for moving this issue forward.

I'm not familiar with the GitHub container repository. Do I need to do something special to activate it?
I guess I will need to update the GitHub Action to use my own ARM64 runner right? Currently, the build is using buildjet-4vcpu-ubuntu-2204-arm. I guess I won't have access to this runner once the project has been transferred to the yuzutech org?

Also, I've noticed that you have a unknown/unknown arch:

[felixvanoost]

The GitHub container registry should be enabled by default; you don't have to do anything special. All you should need to do is change to your local ARM runner as you described, then update the URL of the image in the Dockerfile.