feat: add support for Gradle (#2411) #957

Job	Run time
Build Runner Docker Image	2m 25s
Build Runner Docker Image	2m 25s
Build FTL-in-a-box Docker Image	2m 19s
Build FTL-in-a-box Docker Image	2m 19s
Build Controller Docker Image	2m 48s
Build Controller Docker Image	2m 48s
Release Go Binaries	4m 31s
Release Go Binaries	4m 31s
Release VSCode Extension	43s
Release VSCode Extension	43s
Release Assets	51s
Release Assets	51s
Release Hermit	8s
Release Hermit	13s
	27m 35s

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