feat: use GH Actions and separate Dockerfiles #28

Job	Run time
prepare	7s
go-test	1m 7s
go-build / go-build-smoke-test	23s
gofmt / go-fmt	13s
golangci-lint / lint	19s
go-vet / go-vet	15s
build (fdsn-quake-consumer, ./cmd/fdsn-quake-consumer) / build	39s
build (fdsn-slink-db, ./cmd/fdsn-slink-db) / build	42s
build (fdsn-holdings-consumer, ./cmd/fdsn-holdings-consumer) / build	37s
build (fdsn-ws, ./cmd/fdsn-ws) / build	43s
build (fdsn-ws-nrt, ./cmd/fdsn-ws-nrt) / build	40s
	5m 45s

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