Restore command (#593)

Add waiting for changes to config file

Add max size for config files

Restore files

Restore database file

Expose migrate to

Move init stuff to seperate package

Add restoring config file

Co-authored-by: kolaente <k@knt.li>
Reviewed-on: https://kolaente.dev/vikunja/api/pulls/593

pkg/files/files.go

@@ -96,7 +96,7 @@ func Create(f io.ReadCloser, realname string, realsize uint64, a web.Auth) (file
 	}
 
 	// Save the file to storage with its new ID as path
-	err = afs.WriteReader(file.getFileName(), f)
+	err = file.Save(f)
 	return
 }
 
@@ -113,3 +113,8 @@ func (f *File) Delete() (err error) {
 	err = afs.Remove(f.getFileName())
 	return
 }
+
+// Save saves a file to storage
+func (f *File) Save(fcontent io.ReadCloser) error {
+	return afs.WriteReader(f.getFileName(), fcontent)
+}