Installer: deallocate ports upon app uninstall

Change-Id: I19298537fed02de03a9e74fa351cf23f733de699
diff --git a/core/installer/values-tmpl/soft-serve.cue b/core/installer/values-tmpl/soft-serve.cue
index d172b9b..8aeb49f 100644
--- a/core/installer/values-tmpl/soft-serve.cue
+++ b/core/installer/values-tmpl/soft-serve.cue
@@ -47,6 +47,7 @@
 portForward: [#PortForward & {
 	allocator: input.network.allocatePortAddr
 	reservator: input.network.reservePortAddr
+	deallocator: input.network.deallocatePortAddr
 	sourcePort: input.sshPort
 	serviceName: "soft-serve"
 	targetPort: 22