app/docs/build-image.md

To build a multi-architecture image, you need to use buildx.

Here's the command to build and push the images from a Mac M1:

1. First create a new buildx environment (or context). This is only necessary for the first time.

docker buildx create --use

2. Build and push the image. Replace simplelogin/name:tag by the correct docker image name and tag.

docker buildx build --platform linux/amd64,linux/arm64 --push -t simplelogin/name:tag