specific arch platform

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

Makefile

@@ -7,6 +7,7 @@ DEPLOY_IMAGE := $(EXECUTABLE)
 GOFMT ?= gofmt "-s"
 
 TARGETS ?= linux darwin windows openbsd
+ARCHS ?= amd64 386
 PACKAGES ?= $(shell $(GO) list ./...)
 GOFILES := $(shell find . -name "*.go" -type f)
 TAGS ?= sqlite
@@ -110,7 +111,7 @@ release-build:
 	@hash gox > /dev/null 2>&1; if [ $$? -ne 0 ]; then \
 		$(GO) get -u github.com/mitchellh/gox; \
 	fi
-	gox -os="$(TARGETS)" -tags="$(TAGS)" -ldflags="$(EXTLDFLAGS)-s -w $(LDFLAGS)" -output="$(DIST)/binaries/$(EXECUTABLE)-$(VERSION)-{{.OS}}-{{.Arch}}"
+	gox -os="$(TARGETS)" -arch="$(ARCHS)" -tags="$(TAGS)" -ldflags="$(EXTLDFLAGS)-s -w $(LDFLAGS)" -output="$(DIST)/binaries/$(EXECUTABLE)-$(VERSION)-{{.OS}}-{{.Arch}}"
 
 release-copy:
 	$(foreach file,$(wildcard $(DIST)/binaries/$(EXECUTABLE)-*),cp $(file) $(DIST)/release/$(notdir $(file));)