AppManager: Add API endpoint to install dodo app

Refactors cue definitions.

Next steps:
* Needs some cleanup, namespace is hard coded ...
* Maybe merge with regular install API
* Support exposing ports across clusters

Change-Id: Ibfc3c3f742b61f2c5874012fe6c77b958eae81d9
diff --git a/core/installer/values-tmpl/pihole.cue b/core/installer/values-tmpl/pihole.cue
index 01a3ca1..6607409 100644
--- a/core/installer/values-tmpl/pihole.cue
+++ b/core/installer/values-tmpl/pihole.cue
@@ -65,7 +65,7 @@
 		}
 	}
 
-	volumes: data: size: input.storageSize
+	volume: data: size: input.storageSize
 
 	helm: {
 		pihole: {
@@ -75,7 +75,7 @@
 				fullnameOverride: "pihole"
 				persistentVolumeClaim: {
 					enabled: true
-					existingClaim: volumes.data.name
+					existingClaim: volume.data.name
 				}
 				admin: {
 					enabled: false