GCC for RISC OS Crosscompiler
/opt/gccsdk/bincontains the compiler binaries.
Run make build.
If everything is OK, the container name should be printed at the end.
As the build-world script only ever runs default (one process) builds, the build is quite slow, even on a fast system.
If you want to upload a variant of the image, change or override
CONTAINER_NAME to reference your desired registry/repository.