chore(tree): move package build files in their own directory

Creating pkgbuild directory and move relevant files there.

.packit.yml

@@ -11,7 +11,7 @@ upstream_tag_template: "{version}"
 upstream_project_url: https://github.com/dracutdevs/dracut
 
 # Relative path to a spec file within the upstream repository
-specfile_path: dracut.spec
+specfile_path: pkgbuild/dracut.spec
 
 # Name of the downstream package
 downstream_package_name: dracut

Makefile

@@ -240,7 +240,7 @@ ifeq ($(HAVE_RPMBUILD),yes)
 rpm: dracut-$(DRACUT_MAIN_VERSION).tar.xz syncheck
 	rpmbuild=$$(mktemp -d -p /var/tmp rpmbuild-dracut.XXXXXX); src=$$(pwd); \
 	cp dracut-$(DRACUT_MAIN_VERSION).tar.xz "$$rpmbuild"; \
-	LC_MESSAGES=C $$src/tools/git2spec.pl $(DRACUT_MAIN_VERSION) "$$rpmbuild" < dracut.spec > $$rpmbuild/dracut.spec; \
+	LC_MESSAGES=C $$src/tools/git2spec.pl $(DRACUT_MAIN_VERSION) "$$rpmbuild" < pkgbuild/dracut.spec > $$rpmbuild/dracut.spec; \
 	(cd "$$rpmbuild"; \
 	wget https://www.gnu.org/licenses/lgpl-2.1.txt; \
 	rpmbuild --define "_topdir $$PWD" --define "_sourcedir $$PWD" \
@@ -251,7 +251,7 @@ rpm: dracut-$(DRACUT_MAIN_VERSION).tar.xz syncheck
 srpm: dracut-$(DRACUT_MAIN_VERSION).tar.xz syncheck
 	rpmbuild=$$(mktemp -d -t rpmbuild-dracut.XXXXXX); src=$$(pwd); \
 	cp dracut-$(DRACUT_MAIN_VERSION).tar.xz "$$rpmbuild"; \
-	LC_MESSAGES=C $$src/tools/git2spec.pl $(DRACUT_MAIN_VERSION) "$$rpmbuild" < dracut.spec > $$rpmbuild/dracut.spec; \
+	LC_MESSAGES=C $$src/tools/git2spec.pl $(DRACUT_MAIN_VERSION) "$$rpmbuild" < pkgbuild/dracut.spec > $$rpmbuild/dracut.spec; \
 	(cd "$$rpmbuild"; \
 	[ -f $$src/lgpl-2.1.txt ] && cp $$src/lgpl-2.1.txt . || wget https://www.gnu.org/licenses/lgpl-2.1.txt; \
 	rpmbuild --define "_topdir $$PWD" --define "_sourcedir $$PWD" \