feat: allow user to choose build mode: debug (default) or release #130

Job	Run time
docker	17m 7s
lint	7s
deny	50s
build	1m 52s
parachain-integration-tests	1h 53m 1s
coverage	2m 35s
contract-integration-tests	9m 47s
unit-tests	2m 9s
	2h 27m 28s

Provide feedback