Use tar instead of git archive in Copr Makefile to fix missing git in mock chroot

The mock minimal buildroot does not include git, causing the SRPM build
to fail. Replace git archive with tar which is available in the chroot.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: marcel

.copr/Makefile

@@ -1,16 +1,18 @@
-# Minimal Makefile for COPR builds (CMake-based)
+# Minimal Makefile for COPR builds
 # COPR provides outdir and spec variables when running make srpm
 
 srpm:
 	set -x
 	echo "outdir=$(outdir) spec_path=$(spec)"
+	$(eval VERSION := $(shell cat VERSION))
 	mkdir -p ~/rpmbuild/SOURCES
-	mkdir -p build && cd build && cmake3 .. && make rpmtar
+	tar --transform 's,^\.,sems-$(VERSION),' --exclude=.git -czf ~/rpmbuild/SOURCES/sems-$(VERSION).tar.gz -C $$(pwd) .
 	rpmbuild -bs --define "_sourcedir $$HOME/rpmbuild/SOURCES" \
 		--define "_specdir $$(pwd)" \
 		--define "_builddir $$(pwd)" \
 		--define "_srcrpmdir $(outdir)" \
 		--define "_rpmdir $$(pwd)" \
+		--define "version $(VERSION)" \
 		$(spec)
 
 .PHONY: srpm