Bugfix/gpt reflash (#2266)

* debug entry

* update magic numbers

* remove dbg

* fix hostname

* fix reinstall logic

backend/src/bin/embassy-init.rs

@@ -55,6 +55,8 @@ async fn setup_or_init(cfg_path: Option<PathBuf>) -> Result<(), Error> {
         .await
         .is_err()
     {
+        embassy::hostname::sync_hostname(&embassy::hostname::Hostname("embassy".into())).await?;
+
         let ctx = SetupContext::init(cfg_path).await?;
 
         let server = WebServer::setup(([0, 0, 0, 0], 80).into(), ctx.clone()).await?;