feat: add `ftl box` command tree (#1878) #762

Job	Run time
Build FTL-in-a-box Docker Image	2m 13s
Build Controller Docker Image	2m 23s
Build Runner Docker Image	2m 37s
Release Go Binaries	3m 58s
Release Assets	1m 21s
Release Hermit	7s
	12m 39s

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