Canvas: Let user define name/value env var

Change-Id: I9beffcc6f0dcbb674ef82b37b93b5f5ef7d189bc
diff --git a/apps/canvas/config/src/graph.ts b/apps/canvas/config/src/graph.ts
index 90523d5..3c66fbd 100644
--- a/apps/canvas/config/src/graph.ts
+++ b/apps/canvas/config/src/graph.ts
@@ -62,6 +62,13 @@
 			name: string;
 			alias: string;
 			isEditting: boolean;
+	  }
+	| {
+			id: string;
+			source: null;
+			name: string;
+			value: string;
+			isEditting?: boolean;
 	  };
 
 export type EnvVar = {