added build vars

schemas/base.json

@@ -63,6 +63,35 @@
                 }
               },
               "additionalProperties": false
+            },
+            "args": {
+              "title": "arguments to send to the specified script",
+              "type": "object",
+              "patternProperties": {
+                "^.*$": {
+                  "anyOf": [
+                    {
+                      "type": "object",
+                      "required": [
+                        "type",
+                        "key"
+                      ],
+                      "additionalProperties": false,
+                      "properties": {
+                        "type": {
+                          "enum": [
+                            "env"
+                          ]
+                        },
+                        "key": {
+                          "title": "the environment key to pull arg from",
+                          "type": "string"
+                        }
+                      }
+                    }
+                  ]
+                }
+              }
             }
           }
         }