fix(Makefile): change binary artifact from builder to boot

Fixes #37

Author: arschles

Makefile

@@ -40,7 +40,7 @@ bootstrap:
 # the Docker environment. Other alternatives are cross-compiling, doing
 # the build as a `docker build`.
 build:
-	${DEV_ENV_PREFIX} -e CGO_ENABLED=0 ${DEV_ENV_IMAGE} go build -a -installsuffix cgo -ldflags '-s' -o $(BINARY_DEST_DIR)/builder boot.go || exit 1
+	${DEV_ENV_PREFIX} -e CGO_ENABLED=0 ${DEV_ENV_IMAGE} go build -a -installsuffix cgo -ldflags '-s' -o $(BINARY_DEST_DIR)/boot boot.go || exit 1
 	@$(call check-static-binary,$(BINARY_DEST_DIR)/builder)
 	for i in $(BINARIES); do \
 		${DEV_ENV_PREFIX} -e CGO_ENABLED=0 ${DEV_ENV_IMAGE} go build -a -installsuffix cgo -ldflags '-s' -o $(BINARY_DEST_DIR)/$$i pkg/src/$$i.go || exit 1; \