Add target to build all the binaries

Makefile

@@ -1,3 +1,5 @@
+VERSION := $(shell cat version.go | grep -Eo "[0-9]+\.[0-9]+\.[0-9]+")
+
 pypihub: ./*.go ./cmd/pypihub/*.go
 	go build -o pypihub ./cmd/pypihub/
 
@@ -15,4 +17,16 @@ docker_build: build/pypihub
 docker_up: docker_build
 		docker-compose up --build
 
-.PHONY: clean docker_build docker_up
+build_release: clean
+	# Darwin
+	CGO_ENABLED=0 GOOS=darwin GOARCH=386 go build -a -ldflags '-w' -o build/pypihub.${VERSION}.darwin_386 ./cmd/pypihub/
+	CGO_ENABLED=0 GOOS=darwin GOARCH=amd64 go build -a -ldflags '-w' -o build/pypihub.${VERSION}.darwin_amd64 ./cmd/pypihub/
+	# Linux
+	CGO_ENABLED=0 GOOS=linux GOARCH=386 go build -a -ldflags '-w' -o build/pypihub.${VERSION}.linux_386 ./cmd/pypihub/
+	CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -ldflags '-w' -o build/pypihub.${VERSION}.linux_amd64 ./cmd/pypihub/
+	CGO_ENABLED=0 GOOS=linux GOARCH=arm go build -a -ldflags '-w' -o build/pypihub.${VERSION}.linux_arm ./cmd/pypihub/
+	# Windows
+	CGO_ENABLED=0 GOOS=windows GOARCH=386 go build -a -ldflags '-w' -o build/pypihub.${VERSION}.windows_386 ./cmd/pypihub/
+	CGO_ENABLED=0 GOOS=windows GOARCH=amd64 go build -a -ldflags '-w' -o build/pypihub.${VERSION}.windows_amd64 ./cmd/pypihub/
+
+.PHONY: build_release clean docker_build docker_up