Use local auth .txt files in "non-deployed" environments

server/util/getUsersFromFile.js

@@ -1,10 +1,22 @@
+const path = require('path');
+const fs = require('fs/promises');
+
 const getUsersFromFile = async file => {
-  const response = await fetch(
-    // This needs to be switched back the commented out path.
-    // `https://raw.githubusercontent.com/w3c/aria-at-app/main/${file}`
-    `https://raw.githubusercontent.com/w3c/aria-at-app/development/${file}`
-  );
-  const roleGroupTxt = await response.text();
+  const isDeployed =
+    process.env.ENVIRONMENT === 'sandbox' ||
+    process.env.ENVIRONMENT === 'staging' ||
+    process.env.ENVIRONMENT === 'production';
+
+  let roleGroupTxt;
+  if (isDeployed) {
+    const response = await fetch(
+      `https://raw.githubusercontent.com/w3c/aria-at-app/development/${file}`
+    );
+    roleGroupTxt = await response.text();
+  } else {
+    const filePath = path.join(__dirname, `../../${file}`);
+    roleGroupTxt = await fs.readFile(filePath, { encoding: 'utf8' });
+  }
   const linesRaw = roleGroupTxt.split('\n');
   const noComments = linesRaw.filter(line => line.substr(0, 1) !== '#');
   const noEmpties = noComments.filter(line => line.trim().length > 0);