* Make test workflow smoke test use the same internal name as descriptive name
* Refactor workflow to be test_os then build for that OS
* Run tests on all available github runner environments
* Ensure that dpkg builds will fail if the compile fails
* Allow explicitly overriding the debian package architecture
* Pass the detected architecture into the dpkg build process
* Use the possibly overridden MACHINE variable to calculate the short machine name
* Remove unused variable
* Remove unused AC_SUBST
* Allow EXTN to be overridden instead of MACHINE
* Add crossbuilding for dpkg builds
* Ubnuts dont got no crossbuild for mips
* Use the correct value for EXTN
Hamish Coleman