feat: use GH Actions and separate Dockerfiles #46

Job	Run time
prepare	9s
go-test	1m 4s
golangci-lint / lint	21s
go-build / go-build-smoke-test	17s
go-vet / go-vet	24s
gofmt / go-fmt	14s
build (fdsn-slink-db, ./cmd/fdsn-slink-db) / build	46s
build (fdsn-quake-consumer, ./cmd/fdsn-quake-consumer) / build	1m 19s
build (fdsn-ws-nrt, ./cmd/fdsn-ws-nrt) / build	48s
build (fdsn-holdings-consumer, ./cmd/fdsn-holdings-consumer) / build	1m 7s
build (fdsn-ws, ./cmd/fdsn-ws) / build	1m 7s
	7m 36s

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