[Fix] Use branch HEAD in make tarball

Makefile

@@ -1,6 +1,5 @@
 NAME = netoik-cicd
 VERSION = $(shell [ -d ".git" ] && git describe | sed "s/-/./g")
-BRANCH = $(shell [ -d ".git" ] && git branch --show-current)
 
 TEMP_DIR = "${PWD}/.temp"
 RPM_SOURCEDIR = $(shell rpm --eval "%{_sourcedir}")
@@ -41,7 +40,7 @@ $(RPM_SOURCEDIR)/$(NAME)-%.tar.gz: *
 		--prefix="$(NAME)-$(VERSION)/" \
 		--worktree-attributes \
 		--verbose \
-		"$(BRANCH)"
+		HEAD
 
 .PHONY: tarball
 tarball: $(RPM_SOURCEDIR)/$(NAME)-$(VERSION).tar.gz