Move git checkout to ENV variable

Author: zstyblik

Makefile

@@ -4,6 +4,7 @@
 
 DOCKER_CMD ?= docker
 IPMITOOL_BUILD_DIR ?= $(PWD)/build
+IPMITOOL_GIT_CHECKOUT ?= true
 
 all: build
 
@@ -15,6 +16,6 @@ run:
 	$(DOCKER_CMD) run \
 		-it \
 		--rm \
-		-e GIT_CHECKOUT=true \
+		-e GIT_CHECKOUT=$(IPMITOOL_GIT_CHECKOUT) \
 		-v $(IPMITOOL_BUILD_DIR):/build \
 		ipmitool:latest /bin/bash build-ipmitool.sh