add LEGACY_AUTH env variable (#1473)

src/preload/index.d.ts

@@ -7,6 +7,7 @@ declare global {
         api: PreloadApi;
         electron: ElectronAPI;
         queryLocalFonts?: () => Promise<Font[]>;
+        LEGACY_AUTHENTICATION?: boolean;
         SERVER_LOCK?: boolean;
         SERVER_NAME?: string;
         SERVER_TYPE?: ServerType;

src/preload/local-settings.ts

@@ -78,6 +78,10 @@ export const toServerType = (value?: string): null | string => {
 const SERVER_TYPE = toServerType(process.env.SERVER_TYPE);
 
 const env = {
+    LEGACY_AUTHENTICATION:
+        SERVER_TYPE !== null
+            ? process.env.LEGACY_AUTHENTICATION?.toLocaleLowerCase() === 'true'
+            : false,
     SERVER_LOCK:
         SERVER_TYPE !== null ? process.env.SERVER_LOCK?.toLocaleLowerCase() === 'true' : false,
     SERVER_NAME: process.env.SERVER_NAME ?? '',