chore(argo-workflows-openapi): improve error messages on failure to retrieve argo server schema

Author: davehadley

backend/argo-workflows-openapi/build.rs

@@ -8,10 +8,11 @@ use std::{
 use typify::{TypeSpace, TypeSpaceSettings};
 
 fn main() {
-    let raw_schema = reqwest::blocking::get(env::var("ARGO_SERVER_SCHEMA_URL").unwrap())
-        .unwrap()
-        .text()
-        .unwrap();
+    let argo_server_schema_url =
+        env::var("ARGO_SERVER_SCHEMA_URL").expect("ARGO_SERVER_SCHEMA_URL environment is not set.");
+    let raw_schema = reqwest::blocking::get(&argo_server_schema_url)
+        .and_then(|response| response.text())
+        .expect(&format!("Failed to retrieve argo server schema from {argo_server_schema_url}. Is ARGO_SERVER_SCHEMA_URL environment variable set?"));
     let mut schema: RootSchema = serde_json::from_str(&raw_schema).unwrap();
     // The upstream argo workflow API schema does not match with its API response.
     // This is a temporary fix to match the API response.