Add support for custom profile directory

A custom user data directory can now be specified using the "profile-dir"
command line argument.

Github ref: closes #6175

Signed-off-by: Pacien TRAN-GIRARD <pacien.trangirard@pacien.net>

electron_app/src/electron-main.js

@@ -42,7 +42,9 @@ const Store = require('electron-store');
 // migrating to mitigate any risk of it being used maliciously.
 let migratingOrigin = false;
 
-if (argv['profile']) {
+if (argv['profile-dir']) {
+    app.setPath('userData', argv['profile-dir']);
+} else if (argv['profile']) {
     app.setPath('userData', `${app.getPath('userData')}-${argv['profile']}`);
 }