Allow "lite" Chipyard builds with a minimal subset of submodules #438

Job	Run time
cancel-prior-workflows	4s
start-workflow	2s
filter-jobs-on-changes	5s
setup-persistent-repo	17m 58s
check-conda-lock-modified	0s
run-metasims-xilinx_alveo_u250	5s
run-basic-linux-poweroffs-xilinx_alveo_u250	0s
cleanup-local-fpga-repo	11s
build-default-bitstreams	0s
	18m 25s

Provide feedback