buildrepo: add repository description/version

buildrepo.in

@@ -97,7 +97,9 @@ build() {
 		oldindex="--index APKINDEX.tar.gz"
 	fi
 	tmpindex=$(mktemp).tar.gz
-	apk index $oldindex -o $tmpindex *.apk
+	apk index $oldindex -o $tmpindex \
+		--description "$repo $(cd $aportsdir && git describe)" \
+		*.apk
 	abuild-sign $tmpindex && mv $tmpindex APKINDEX.tar.gz
 	chmod 644 APKINDEX.tar.gz
 	rm -f tmp.*