feat: add CUDA builds for Linux and Windows

- CI: add Linux (CUDA) and Windows (CUDA) test targets
- Release: add CUDA variants (vox-*-cuda.tar.gz/zip)
- Uses Jimver/cuda-toolkit@v0.2.22 with CUDA 12.6.3
- CUDA binaries ship alongside CPU binaries in releases

Author: pszymkowiak

.github/workflows/ci.yml

@@ -26,10 +26,20 @@ jobs:
             os: ubuntu-latest
             features: ""
             deps: libasound2-dev
+          - name: Linux (CUDA)
+            os: ubuntu-latest
+            features: cuda
+            deps: libasound2-dev
+            cuda: true
           - name: Windows (CPU)
             os: windows-latest
             features: ""
             deps: ""
+          - name: Windows (CUDA)
+            os: windows-latest
+            features: cuda
+            cuda: true
+            deps: ""
 
     steps:
       - uses: actions/checkout@v4
@@ -41,14 +51,22 @@ jobs:
         if: matrix.deps != ''
         run: sudo apt-get update && sudo apt-get install -y ${{ matrix.deps }}
 
+      - name: Install CUDA toolkit
+        if: matrix.cuda == true
+        uses: Jimver/cuda-toolkit@v0.2.22
+        with:
+          cuda: '12.6.3'
+          method: network
+          sub-packages: '["nvcc", "cudart"]'
+
       - name: Cache cargo
         uses: actions/cache@v4
         with:
           path: |
             ~/.cargo/registry
             ~/.cargo/git
             target
-          key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+          key: ${{ runner.os }}-${{ matrix.features }}-cargo-${{ hashFiles('**/Cargo.lock') }}
 
       - name: Build
         run: cargo build ${{ matrix.features != '' && format('--features {0}', matrix.features) || '' }}
@@ -57,6 +75,7 @@ jobs:
         run: cargo test ${{ matrix.features != '' && format('--features {0}', matrix.features) || '' }}
 
       - name: Check formatting
+        if: matrix.cuda != true
         run: cargo fmt -- --check
 
       - name: Clippy

.github/workflows/release.yml

@@ -33,19 +33,33 @@ jobs:
             os: macos-latest
             features: metal
             archive: tar.gz
+            artifact_suffix: ""
           # x86_64-apple-darwin removed: ort (via piper-rs) has no prebuilt
           # binaries for Intel Macs. Intel Macs are EOL.
           - target: x86_64-unknown-linux-gnu
             os: ubuntu-latest
             features: ""
             archive: tar.gz
             deps: libasound2-dev
-          # TODO: aarch64-unknown-linux-gnu requires cross-compilation setup
-          # Re-enable once CI cross-compile is working (#56)
+            artifact_suffix: ""
+          - target: x86_64-unknown-linux-gnu
+            os: ubuntu-latest
+            features: cuda
+            archive: tar.gz
+            deps: libasound2-dev
+            cuda: true
+            artifact_suffix: "-cuda"
           - target: x86_64-pc-windows-msvc
             os: windows-latest
             features: ""
             archive: zip
+            artifact_suffix: ""
+          - target: x86_64-pc-windows-msvc
+            os: windows-latest
+            features: cuda
+            archive: zip
+            cuda: true
+            artifact_suffix: "-cuda"
 
     steps:
       - name: Checkout
@@ -56,35 +70,43 @@ jobs:
         with:
           targets: ${{ matrix.target }}
 
-      - name: Install system deps (Linux native)
-        if: matrix.deps != '' && matrix.cross != true
+      - name: Install system deps (Linux)
+        if: matrix.deps != ''
         run: |
           sudo apt-get update
           sudo apt-get install -y ${{ matrix.deps }}
 
+      - name: Install CUDA toolkit
+        if: matrix.cuda == true
+        uses: Jimver/cuda-toolkit@v0.2.22
+        with:
+          cuda: '12.6.3'
+          method: network
+          sub-packages: '["nvcc", "cudart"]'
+
       - name: Build
         run: cargo build --release --target ${{ matrix.target }} ${{ matrix.features != '' && format('--features {0}', matrix.features) || '' }}
 
       - name: Package (tar.gz)
         if: matrix.archive == 'tar.gz'
         run: |
           cd target/${{ matrix.target }}/release
-          tar -czvf ../../../vox-${{ matrix.target }}.${{ matrix.archive }} vox
+          tar -czvf ../../../vox-${{ matrix.target }}${{ matrix.artifact_suffix }}.${{ matrix.archive }} vox
           cd ../../..
 
       - name: Package (zip)
         if: matrix.archive == 'zip'
         shell: bash
         run: |
           cd target/${{ matrix.target }}/release
-          7z a ../../../vox-${{ matrix.target }}.zip vox.exe
+          7z a ../../../vox-${{ matrix.target }}${{ matrix.artifact_suffix }}.zip vox.exe
           cd ../../..
 
       - name: Upload artifact
         uses: actions/upload-artifact@v4
         with:
-          name: vox-${{ matrix.target }}
-          path: vox-${{ matrix.target }}.${{ matrix.archive }}
+          name: vox-${{ matrix.target }}${{ matrix.artifact_suffix }}
+          path: vox-${{ matrix.target }}${{ matrix.artifact_suffix }}.${{ matrix.archive }}
 
   release:
     name: Upload Release Assets