Build Windows binary in shared Steam depot

## Summary
- register Bevy's image loader explicitly in the headless asset processor
- use no GPU-compressed image formats because the processor has no render device
- allow PNG processing tasks to complete so `ProcessorState` reaches `Finished`

Co-authored-by: Álex Román Núñez <eirexe@eirteam.moe>

.gitea/workflows/ci.yml

@@ -21,6 +21,8 @@ jobs:
             sh -s -- -y --profile minimal
           echo "$HOME/.cargo/bin" >> "$GITHUB_PATH"
           "$HOME/.cargo/bin/rustup" toolchain install nightly-2026-09-14 --profile minimal
+          "$HOME/.cargo/bin/rustup" target add x86_64-pc-windows-msvc --toolchain nightly-2026-09-14
+          "$HOME/.cargo/bin/cargo" install cargo-xwin --locked
 
       - name: Cache Rust dependencies and build artifacts
         uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
@@ -41,6 +43,7 @@ jobs:
             libx11-dev \
             libxkbcommon-dev \
             libxkbcommon-x11-0 \
+            lld \
             mesa-vulkan-drivers \
             mold \
             pkg-config
@@ -94,6 +97,9 @@ jobs:
       - name: Build production binary
         run: cargo build --locked --profile production --no-default-features --features debug_features -j 4
 
+      - name: Build Windows production binary
+        run: cargo xwin build --locked --target x86_64-pc-windows-msvc --profile production --no-default-features --features debug_features -j 4 --bin shinespark
+
       - name: Verify production binary is not Bevy/Rust dynamically linked
         run: |
           ! readelf -d target/production/shinespark | grep -E 'libbevy_dylib|libstd-.*\.so'
@@ -101,10 +107,10 @@ jobs:
       - name: Package Linux Steam depot
         if: github.event_name == 'push' && github.ref == 'refs/heads/master'
         run: |
-          mkdir -p build/linux
+          mkdir -p build/game
-          cp target/production/shinespark build/linux/shinespark
+          cp target/production/shinespark build/game/shinespark
-          cp -R assets build/linux/assets
+          cp target/x86_64-pc-windows-msvc/production/shinespark.exe build/game/shinespark.exe
-          cp -R imported_assets build/linux/imported_assets
+          cp -R imported_assets build/game/imported_assets
 
       - if: github.event_name == 'push' && github.ref == 'refs/heads/master'
         uses: CyberAndrii/steam-totp@v1
@@ -123,5 +129,5 @@ jobs:
           appId: 3409670
           buildDescription: ${{ github.sha }}
           rootPath: build
-          depot1Path: linux
+          depot1Path: game
           releaseBranch: master

src/bin/process-assets.rs

@@ -2,7 +2,7 @@ use bevy::{
     app::ScheduleRunnerPlugin,
     asset::{AssetMode, AssetPlugin, processor::AssetProcessor, processor::ProcessorState},
     gltf::GltfPlugin,
-    image::ImagePlugin,
+    image::{CompressedImageFormats, ImageLoader, ImagePlugin},
     prelude::*,
     tasks::block_on,
     text::TextPlugin,
@@ -19,6 +19,7 @@ fn main() -> ExitCode {
             ..default()
         })
         .add_plugins((ImagePlugin::default(), TextPlugin, GltfPlugin::default()))
+        .register_asset_loader(ImageLoader::new(CompressedImageFormats::NONE))
         .add_plugins(AssetProcessingPlugin)
         .add_systems(Update, finish_when_processed);