app-MAIL-temp/docs/build-image.md

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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.
```bash
docker buildx create --use
```
2) Build and push the image. Replace `simplelogin/name:tag` by the correct docker image name and tag.
```bash
docker buildx build --platform linux/amd64,linux/arm64 --push -t simplelogin/name:tag
```