schema: allow the "type" property for composable images

Author: pjcdawkins

validator/schema/upsun.json

@@ -42,8 +42,8 @@
           "firewall": {"$ref": "#/definitions/firewall"},
           "type": {
             "type": "string",
-            "title": "The base runtime (language) and version to use for this application",
-            "description": "The base image to use with a specific app language.  \nFormat: runtime:version. \nMore information: \nhttps://docs.upsun.com/create-apps/app-reference/single-runtime-image.html#types"
+            "title": "The base runtime and version to use for this application",
+            "description": "The base image to use.  \nFormat: runtime:version. \nMore information: \nhttps://docs.upsun.com/create-apps/app-reference/single-runtime-image.html#types"
           },
           "runtime": {
             "type": "object",
@@ -687,41 +687,30 @@
             "description": "More information: \nhttps://docs.upsun.com/create-apps/app-reference/single-runtime-image.html#additional-hosts"
           },
           "stack": {
-            "oneOf": [
-              {
-                "type": "string"
-              },
-              {
-                "type": "object"
-              },
-              {
-                "type": "array",
-                "items": {
-                  "oneOf": [
-                    {
-                      "type": "string"
-                    },
-                    {
-                      "type": "object"
-                    }
-                  ]
+            "type": "array",
+            "items": {
+              "oneOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "object"
                 }
-              }
-            ],
+              ],
+              "description": "A package definition, for example 'package@version' (for services) or just 'package' (for tools)."
+            },
             "title": "Composable Image definition",
-            "description": "A list of packages from the Upsun collection of supported runtimes and/or from NixPkgs.  \nMore information: \nhttps://docs.upsun.com/create-apps/app-reference/composable-image.html"
-          }
+            "description": "A list of Nix packages from NixPkgs.  \nMore information: \nhttps://docs.upsun.com/create-apps/app-reference/composable-image.html"          }
         },
-        "oneOf": [
+        "anyOf": [
           {
-            "required": [
-              "type"
-            ]
+            "required": ["type"]
           },
           {
-            "required": [
-              "stack"
-            ]
+            "required": ["stack"]
+          },
+          {
+            "required": ["type", "stack"]
           }
         ],
         "additionalProperties": false

validator/validator_test.go

@@ -171,7 +171,7 @@ services:
 						Data: []byte(`
 applications:
   app1:
-    type: "python:3.11"
+    type: "composable:25.05"
     stack:
       - "[email protected]":
         extensions:
@@ -195,7 +195,7 @@ services:
 					},
 				},
 			},
-			wantErr: true,
+			wantErr: false,
 		},
 		{
 			name: "true-boolean",