refactor persistency

server/texture-sync-server/src/model/texture_format.rs

@@ -8,6 +8,12 @@ pub enum TextureFormat {
     JPEG,
 }
 
+impl TextureFormat {
+    fn variants() -> &'static [TextureFormat] {
+        &[TextureFormat::PNG, TextureFormat::JPEG]
+    }
+}
+
 #[cfg(test)]
 mod tests {
     // Lol, I thought we would need custom code, like for Sha256, but it works out of the box :D