Run mix as the pleroma user

src/freedombone-app-pleroma

@@ -1382,7 +1382,7 @@ function install_pleroma {
     systemctl start pleroma
 
     cd $PLEROMA_DIR || exit 1935638
-    mix register_user "$MY_USERNAME" "$MY_USERNAME" "$MY_EMAIL_ADDRESS" $"Your bio goes here" "$PLEROMA_ADMIN_PASSWORD"
+    sudo -u pleroma mix register_user "$MY_USERNAME" "$MY_USERNAME" "$MY_EMAIL_ADDRESS" $"Your bio goes here" "$PLEROMA_ADMIN_PASSWORD"
     sudo -u pleroma mix set_moderator "$MY_USERNAME" true
 
     APP_INSTALLED=1