fix Makefile GOARCH

Author: zhudabai

Makefile

@@ -1,10 +1,10 @@
 default:
 	CGO_ENABLED=0 go build -ldflags="-s -w"
 linux-amd64:
-	CGO_ENABLED=0 GO_ARCH=amd64 GOOS=linux go build -ldflags="-s -w" -o build/schem-diff-linux-amd64
+	CGO_ENABLED=0 GOARCH=amd64 GOOS=linux go build -ldflags="-s -w" -o build/schem-diff-linux-amd64
 linux-arm64:
-	CGO_ENABLED=0 GO_ARCH=arm64 GOOS=linux go build -ldflags="-s -w" -o build/schem-diff-linux-arm64
+	CGO_ENABLED=0 GOARCH=arm64 GOOS=linux go build -ldflags="-s -w" -o build/schem-diff-linux-arm64
 darwin-amd64:
-	CGO_ENABLED=0 GO_ARCH=amd64 GOOS=darwin go build -ldflags="-s -w" -o build/schem-diff-darwin-amd64
+	CGO_ENABLED=0 GOARCH=amd64 GOOS=darwin go build -ldflags="-s -w" -o build/schem-diff-darwin-amd64
 darwin-arm64:
-	CGO_ENABLED=0 GO_ARCH=arm64 GOOS=darwin go build -ldflags="-s -w" -o build/schem-diff-darwin-arm64
+	CGO_ENABLED=0 GOARCH=arm64 GOOS=darwin go build -ldflags="-s -w" -o build/schem-diff-darwin-arm64