RequestAdapterError::NoAdapterFound when disabling RenderPlugin in low‑traffic Bevy workloads

The RequestAdapterError::NoAdapterFound appears because disabling RenderPlugin leaves WinitPlugin active; Winit creates a GPU surface that requires a physical display, which is absent in headless CI, causing wgpu to fail to request an adapter.

Confirmed facts (research):

• Disabling RenderPlugin alone does not stop WinitPlugin from creating a surface.
• Headless WinitPlugin (`.with_headless(true).with_visibility(Visibility::Hidden)`) allows wgpu to initialise a virtual adapter without a physical GPU.
• MinimalPlugins must contain SchedulerPlugin (or FixedTimestepPlugin) and LoggingPlugin to keep essential scheduling and logging.
• AudioPlugin may also request a surface; disable it if not needed.

Steps to resolve (apply only to this case):

1. Replace DefaultPlugins with MinimalPlugins that includes SchedulerPlugin, LoggingPlugin, and a headless WinitPlugin:

   let mut plugins = MinimalPlugins::default();
   plugins = plugins.with_scheduler();
   plugins = plugins.with_logging();
   plugins = plugins.with_winit(bevy::winit::WinitPlugin::new()
       .with_headless(true)
       .with_visibility(bevy::winit::Visibility::Hidden));
   

2. If your Bevy version lacks .with_headless, either upgrade winit/Bevy or add a custom plugin that creates a software wgpu adapter (e.g., using wgpu::Backends::GL), but this is not officially supported.
3. Disable AudioPlugin (or any other plugin that may request a surface) unless audio is required:

   plugins = plugins.without_audio(); // or simply omit AudioPlugin from MinimalPlugins
   

4. Run the application and verify that wgpu::Instance::request_adapter returns success without “NoAdapterFound” logs.
5. Optionally, set a modest FixedTimestep (e.g., 0.016 s) and configure RunMode::Loop to pause updates while idle, preventing the “spiral of death” when a large wait_duration is used:

   app.insert_resource(FixedTimestep::from_seconds(0.016));
   app.set_run_mode(RunMode::Loop);
   

Missing diagnostic: confirm that your Bevy/winit combination includes the .with_headless(true) API (Bevy ≥ 0.11, winit ≥ 0.28). If not, the headless approach will fall back to a physical GPU and the error will persist.