restore daemon: log about doing basic system env setup

debugging history showed that its surely nice to have more logs at
when stuff happens (and thus fails)

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

src/bin/proxmox-restore-daemon.rs

@@ -53,7 +53,8 @@ fn main() -> Result<(), Error> {
         .format_timestamp_millis()
         .init();
 
-    setup_system_env()?;
+    info!("setup basic system environment...");
+    setup_system_env().map_err(|err| format_err!("system environment setup failed: {}", err))?;
 
     // scan all attached disks now, before starting the API
     // this will panic and stop the VM if anything goes wrong