Refactor/project structure (#3085)

* refactor project structure

* environment-based default registry

* fix tests

* update build container

* use docker platform for iso build emulation

* simplify compat

* Fix docker platform spec in run-compat.sh

* handle riscv compat

* fix bug with dep error exists attr

* undo removal of sorting

* use qemu for iso stage

---------

Co-authored-by: Mariusz Kogen <k0gen@pm.me>
Co-authored-by: Matt Hill <mattnine@protonmail.com>

core/src/registry/os/mod.rs

@@ -0,0 +1,32 @@
+use rpc_toolkit::{Context, HandlerExt, ParentHandler, from_fn_async};
+
+use crate::context::CliContext;
+use crate::prelude::*;
+use crate::util::serde::HandlerExtSerde;
+
+pub const SIG_CONTEXT: &str = "startos";
+
+pub mod asset;
+pub mod index;
+pub mod version;
+
+pub fn os_api<C: Context>() -> ParentHandler<C> {
+    ParentHandler::new()
+        .subcommand(
+            "index",
+            from_fn_async(index::get_os_index)
+                .with_metadata("authenticated", Value::Bool(false))
+                .with_display_serializable()
+                .with_about("List index of OS versions")
+                .with_call_remote::<CliContext>(),
+        )
+        .subcommand(
+            "asset",
+            asset::asset_api::<C>().with_about("Commands to add, sign, or get registry assets"),
+        )
+        .subcommand(
+            "version",
+            version::version_api::<C>()
+                .with_about("Commands to add, remove, or list versions or version signers"),
+        )
+}