How to: 🛠 Multi-platform support
Build for multiple platforms in parallel.

```earthly
VERSION 0.8
all:
    BUILD \
        --platform=linux/amd64 \
        --platform=linux/arm64 \
        --platform=linux/arm/v7 \
        --platform=linux/arm/v6 \
        +build

build:
    FROM alpine:3.18
    CMD ["uname", "-m"]
    SAVE IMAGE multiplatform-image
```