Restore fails when no `.env` file exists

[mStirner]

[2025.02.12 - 12:14.25.299][error][system] Uncaught rejection catched! Error: ENOENT: no such file or directory, open '/opt/OpenHaus/backend/.env'
    at Object.openSync (node:fs:573:18)
    at Object.truncateSync (node:fs:1088:17)
    at Extract.<anonymous> (/opt/OpenHaus/backend/routes/router.system.backup.js:1:3048)
    at Extract.emit (node:events:518:28)
    at Extract._consumeHeader (/opt/OpenHaus/backend/node_modules/tar-stream/extract.js:173:10)
    at Extract._update (/opt/OpenHaus/backend/node_modules/tar-stream/extract.js:272:41)
    at Extract._unlock (/opt/OpenHaus/backend/node_modules/tar-stream/extract.js:135:10)
    at WriteStream.<anonymous> (/opt/OpenHaus/backend/routes/router.system.backup.js:1:2994)
    at Object.onceWrapper (node:events:632:28)
    at WriteStream.emit (node:events:530:35) {
  errno: -2,
  code: 'ENOENT',
  syscall: 'open',
  path: '/opt/OpenHaus/backend/.env'
}