* Use bootstrapper for build environment installation.
* Publishing tags.
* Path.
* Minimisation of final image.
* Minimisation of final image.
* QMK distribution $PATH manipulation, to match qmk_firmware.
* QMK distribution $PATH manipulation, to match qmk_firmware.
* Fixup library search path on macOS.
* Escape hatch for path prefix.
* Add new environment variables.