tools: Add RSYNC_OPTS array

Signed-off-by: Matt Turner <mattst88@gentoo.org>

tools/catalyst-auto-amd64.conf

@@ -74,13 +74,13 @@ upload() {
 		-o VerifyHostKeyDNS=yes
 		-o StrictHostKeyChecking=no
 	)
-	rsync \
-	-e "${SSH_CMD[*]}" \
-	-a \
-	--omit-dir-times \
-	--delay-updates \
-	"$@" \
-	"${UPLOAD_DEST}"
+	local RSYNC_OPTS=(
+		-e "${SSH_CMD[*]}"
+		--archive
+		--omit-dir-times
+		--delay-updates
+	)
+	rsync "${RSYNC_OPTS[@]}" "$@" ${UPLOAD_DEST}
 }
 
 post_build() {