Format ssh private key on input

dashboard/src/components/BackupSiteConfigDialog.vue

@@ -1,6 +1,6 @@
 <script setup>
 
-import { ref, useTemplateRef } from 'vue';
+import { ref, useTemplateRef, watch } from 'vue';
 import { MaskedInput, Dialog, FormGroup, TextInput, Checkbox } from '@cloudron/pankow';
 import { prettyBinarySize } from '@cloudron/pankow/utils';
 import { s3like, mountlike, regionName } from  '../utils.js';
@@ -38,6 +38,11 @@ const useHardlinks = ref(false);
 const chown = ref(false);
 const preserveAttributes = ref(false);
 
+watch(mountOptionsPrivateKey, () => {
+  if (!mountOptionsPrivateKey.value) return;
+  mountOptionsPrivateKey.value = mountOptionsPrivateKey.value.replaceAll('\\n', '\n');
+});
+
 async function onSubmit() {
   busy.value = true;