install: allow preprocessing

container/quadlet/radvd.container.in

@@ -1,5 +1,5 @@
 [Container]
-Image=localhost/radvd:latest
+Image=%IMAGE%
 Network=host
 Volume=/etc/radvd.conf:/etc/radvd.conf:ro
 AddCapability=CAP_NET_RAW

container/scripts/label-install

@@ -32,7 +32,7 @@ fi
 
 if test ! -e "$QUADLET_DIR/$QUADLET_FILENAME"; then
 	mkdir -p "$QUADLET_DIR"
-	sed -e "s,%IMAGE%,%{IMAGE},g" "$ORIGIN/container/systemd/${QUADLET_FILENAME}.in" \
+	sed -e "s,%IMAGE%,%{IMAGE},g" "$ORIGIN/container/quadlet/${QUADLET_FILENAME}.in" \
 							> "$QUADLET_DIR/${QUADLET_FILENAME}"
 	echo "radvd-install: installed $QUADLET_FILENAME quadlet"
 	chroot "$HOST" systemctl daemon-reload