feat(featctl/makefile): add release command

featctl/Makefile

@@ -1,6 +1,11 @@
 VERSION = $(shell (git describe --tags --abbrev=0 2>/dev/null || echo '0.0.0') | tr -d v)
 COMMIT = $(shell git rev-parse --short HEAD)
 
+PLATFORMS := darwin/amd64 linux/amd64 windows/amd64
+temp = $(subst /, ,$@)
+os = $(word 1, $(temp))
+arch = $(word 2, $(temp))
+
 OUT = build/
 
 .DEFAULT_GOAL := build
@@ -17,6 +22,16 @@ build:
 		-X $$(go list -m)/version.Commit=$(COMMIT) \
 		-X $$(go list -m)/version.Built=$$(date -u +%FT%T+00:00)"
 
+release: $(PLATFORMS)
+
+$(PLATFORMS):
+	@ GOOS=$(os) GOARCH=$(arch) go build -o $(OUT)featctl-$(os)-$(arch) -ldflags "-s -w \
+		-X $$(go list -m)/version.Version=$(VERSION) \
+		-X $$(go list -m)/version.Commit=$(COMMIT) \
+		-X $$(go list -m)/version.Built=$$(date -u +%FT%T+00:00)"
+
+.PHONY: release $(PLATFORMS)
+
 .PHONY: test
 test:
 	@go test -race -coverprofile=coverage.out -covermode=atomic ./...