feat(demo): allow mutations in demo mode via DEMO_READ_ONLY flag (#6224)

packages/api/src/env.ts

@@ -6,9 +6,11 @@ export const env = createEnv({
   server: {
     KUBERNETES_SERVICE_ACCOUNT_NAME: z.string().optional(),
     DEMO_MODE: createBooleanSchema(false),
+    DEMO_READ_ONLY: createBooleanSchema(true),
   },
   runtimeEnv: {
     KUBERNETES_SERVICE_ACCOUNT_NAME: process.env.KUBERNETES_SERVICE_ACCOUNT_NAME,
     DEMO_MODE: process.env.DEMO_MODE,
+    DEMO_READ_ONLY: process.env.DEMO_READ_ONLY,
   },
 });