Fix: either this env var is a typo, or it's undocumented

Author: Gavin King

sources/httpUtils.ts

@@ -32,7 +32,7 @@ async function fetch(input: string | URL, init?: RequestInit) {
     } else if (`COREPACK_NPM_PASSWORD` in process.env) {
       headers =  {
         ...headers,
-        authorization: `Basic ${Buffer.from(`${process.env.COREPACK_NPM_USER}:${process.env.COREPACK_NPM_PASSWORD}`).toString(`base64`)}`,
+        authorization: `Basic ${Buffer.from(`${process.env.COREPACK_NPM_USERNAME}:${process.env.COREPACK_NPM_PASSWORD}`).toString(`base64`)}`,
       };
     }
   }

tests/_registryServer.mjs

@@ -127,7 +127,7 @@ switch (process.env.AUTH_TYPE) {
 
   case `COREPACK_NPM_PASSWORD`:
     process.env.COREPACK_NPM_REGISTRY = `http://${address.includes(`:`) ? `[${address}]` : address}:${port}`;
-    process.env.COREPACK_NPM_USER = `user`;
+    process.env.COREPACK_NPM_USERNAME = `user`;
     process.env.COREPACK_NPM_PASSWORD = `pass`;
     break;