fix(boil): Revert accidental default registry change from #1281 (#1288)

Author: Techassi

rust/boil/src/build/cli.rs

@@ -47,7 +47,7 @@ pub struct BuildArguments {
     /// The format is host[:port].
     #[arg(
         short, long,
-        default_value_t = HostPort::localhost(),
+        default_value_t = Self::default_registry(),
         value_hint = ValueHint::Hostname,
         help_heading = "Registry Options"
     )]
@@ -125,6 +125,13 @@ impl BuildArguments {
         "0.0.0-dev".parse().expect("must be a valid SemVer")
     }
 
+    fn default_registry() -> HostPort {
+        HostPort {
+            host: Host::Domain(String::from("oci.stackable.tech")),
+            port: None,
+        }
+    }
+
     // TODO: Auto-detect this
     fn default_architecture() -> TargetPlatform {
         TargetPlatform::Linux(Architecture::Amd64)