clean up makefile

Makefile

@@ -1,32 +1,27 @@
 SHELL:=/bin/bash
-BUILD_OS=darwin
-BUILD_ARCH=arm64 
 GO_FILES=$(shell go list ./... | grep -v /vendor/)
 
 COSIGN_VERSION=v2.2.2+carbide.2
 
-BUILD_VERSION=$(shell cat VERSION)
-BUILD_TAG=$(BUILD_VERSION)
-
 .SILENT:
 
 all: fmt vet install test
 
 build:
 	rm -rf cmd/hauler/binaries;\
 	mkdir -p cmd/hauler/binaries;\
-    wget -P cmd/hauler/binaries/ https://github.com/rancher-government-carbide/cosign/releases/download/$(COSIGN_VERSION)/cosign-$(BUILD_OS)-$(BUILD_ARCH);\
+    wget -P cmd/hauler/binaries/ https://github.com/rancher-government-carbide/cosign/releases/download/$(COSIGN_VERSION)/cosign-$(shell go env GOOS)-$(shell go env GOARCH);\
 	mkdir bin;\
-	GOENV=GOARCH=$(BUILD_ARCH) CGO_ENABLED=0 go build -o bin ./cmd/...;\
+	CGO_ENABLED=0 go build -o bin ./cmd/...;\
 
 build-all: fmt vet
 	goreleaser build --rm-dist --snapshot
 
 install:
 	rm -rf cmd/hauler/binaries;\
 	mkdir -p cmd/hauler/binaries;\
-    wget -P cmd/hauler/binaries/ https://github.com/rancher-government-carbide/cosign/releases/download/$(COSIGN_VERSION)/cosign-$(BUILD_OS)-$(BUILD_ARCH);\
-	GOENV=GOARCH=$(BUILD_ARCH) CGO_ENABLED=0 go install ./cmd/...;\
+	wget -P cmd/hauler/binaries/ https://github.com/rancher-government-carbide/cosign/releases/download/$(COSIGN_VERSION)/cosign-$(shell go env GOOS)-$(shell go env GOARCH);\
+	CGO_ENABLED=0 go install ./cmd/...;\
 
 vet:
 	go vet $(GO_FILES)