Fix COPR build failure

The .copr/Makefile has been updated to fix COPR build failure
caused by changes in Git 2.35.2:
fatal: unsafe repository (<current dir> is owned by someone else)

https://stackoverflow.com/questions/71901632/fatal-unsafe-repository-home-repon-is-owned-by-someone-else

.copr/Makefile

@@ -1,5 +1,6 @@
 srpm:
 	dnf install -y git
+	git config --global --add safe.directory ${PWD}
 	./build.sh --with-timestamp --with-commit-id srpm
 	if [[ "${outdir}" != "" ]]; then \
 	    mv ${HOME}/build/pki/SRPMS/* ${outdir}; \