Add production build pipeline (#46)

## Summary
- split development dynamic linking from production builds
- add headless processed-asset generation
- add a separate production CI cache and static Bevy/Rust linkage verification
- keep custom debug features enabled for production builds behind a feature gate

Reviewed-on: #46
Co-authored-by: Álex Román Núñez <eirexe@eirteam.moe>

src/main.rs

@@ -1,8 +1,11 @@
 use bevy::asset::AssetMode::Processed;
+#[cfg(feature = "debug_features")]
 use bevy::camera_controller::free_camera::FreeCameraPlugin;
 use bevy::image::{ImageAddressMode, ImagePlugin, ImageSamplerDescriptor};
 use bevy::prelude::*;
+#[cfg(feature = "debug_features")]
 use bevy_egui::EguiPlugin;
+#[cfg(feature = "debug_features")]
 use bevy_inspector_egui::quick::WorldInspectorPlugin;
 
 fn main() -> AppExit {
@@ -20,16 +23,22 @@ fn main() -> AppExit {
         })
         .set(AssetPlugin {
             mode: Processed,
+            use_asset_processor_override: Some(cfg!(feature = "development")),
             ..default()
         });
 
-    App::new()
-        .add_plugins(default_plugins)
+    let mut app = App::new();
+    app.add_plugins(default_plugins)
         .add_plugins(avian3d::prelude::PhysicsPlugins::default())
         .add_plugins(shinespark::GamePlugin)
-        .add_plugins(FreeCameraPlugin)
-        .add_plugins(EguiPlugin::default())
-        .add_plugins(WorldInspectorPlugin::default()) // adds default options and `InspectorEguiImpl`s
-        .insert_resource(Time::<Fixed>::from_hz(60.0))
-        .run()
+        .insert_resource(Time::<Fixed>::from_hz(60.0));
+
+    #[cfg(feature = "debug_features")]
+    app.add_plugins((
+        FreeCameraPlugin,
+        EguiPlugin::default(),
+        WorldInspectorPlugin::default(),
+    ));
+
+    app.run()
 }