Switch to grails/github-actions #1022

Job	Run time
core-tests	2m 43s
build	2m 22s
functional-test (static)	5m 21s
functional-test (annotation)	5m 23s
functional-test (requestmap)	5m 31s
functional-test (basic)	5m 13s
functional-test (basicCacheUsers)	5m 22s
functional-test (misc)	2m 31s
functional-test (putWithParams)	1m 27s
functional-test (bcrypt)	2m 18s
functional-test (issue503)	1m 29s
	39m 40s

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