Methods
Emulation
Using QEMU which is provided with Docker Desktop.
The image used in FROM must be available on the target platform.
Cross-compilation
Using image provided capabilities to cross-compile.
GOOS and GOARCH for Go build commandGo.
Use ARGs provided by Docker:
Set using --platform flag in build command.
BUILDPLATFORM- platform of the host running the buildBUILDOS- OS part of theBUILDPLATFORMBUILDARCH- arch part of theBUILDPLATFORMTARGETPLATFORM- target platformTARGETOS- OS part of theTARGETPLATFORMTARGETARCH- architecture part of theTARGETPLATFORM
Examples
go uses different Dockerfile for each arch/OS variant. See: docker library/golang
hello-world uses the same approach: docker-library/hello-world