[Fix] Use branch HEAD for git archive command

Makefile

@@ -1,6 +1,5 @@
 NAME = netoik-api
 VERSION = $(shell [ -d ".git" ] && git describe | sed "s/-/./g")
-BRANCH = $(shell [ -d ".git" ] && git branch --show-current)
 
 SYSCONFDIR = $(shell rpm --eval "%{_sysconfdir}")
 UNITDIR = $(shell rpm --eval "%{_unitdir}")
@@ -22,7 +21,12 @@ version:
 tarball: $(HOME)/rpmbuild/SOURCES/$(NAME)-$(VERSION).tar.gz
 
 $(HOME)/rpmbuild/SOURCES/$(NAME)-%.tar.gz: .
-	git archive --format=tar.gz --output=$@ --prefix=$(NAME)-$(VERSION)/ --worktree-attributes --verbose $(BRANCH)
+	git archive --format=tar.gz \
+		--output=$@ \
+		--prefix=$(NAME)-$(VERSION)/ \
+		--worktree-attributes \
+		--verbose \
+		HEAD
 
 .PHONY: install
 install: