Match how github generates tarballs when signing

Author: kpcyrd

Makefile

@@ -53,6 +53,6 @@ tag:
 .PHONY: release
 release:
 	mkdir -p releases
-	git archive --prefix=${PROGNM}-${TAG}/ -o releases/${PROGNM}-${TAG}.tar.gz ${TAG};
+	git -c tar.tar.gz.command='gzip -cn' archive --prefix=${PROGNM}-${TAG}/ -o releases/${PROGNM}-${TAG}.tar.gz ${TAG}
 	gpg --detach-sign -o releases/${PROGNM}-${TAG}.tar.gz.sig releases/${PROGNM}-${TAG}.tar.gz
 	hub release create -m "Release: ${TAG}" -a releases/${PROGNM}-${TAG}.tar.gz.sig -a releases/${PROGNM}-${TAG}.tar.gz ${TAG}