harnessing multiple cores in compilation

[smatkovi]

i would suggest when compiling in the sdk to replace ./scons with ./scons -j$(nproc) to harness all cores, it takes a really long time to compile swift otherwise

[geobra]

Indeed. This will speed up the scons build. But keep in mind that this also uses more resources on the host. I always run in errors within github actions, if I use all the available cores.