Fix aarch64-musl release build: replace musl.cc with cross

musl.cc download times out in GitHub Actions causing release build
failures. Switch to cross-rs/cross which handles the MUSL ARM64
toolchain via Docker containers.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: nbafrank

.github/workflows/release.yml

@@ -30,6 +30,7 @@ jobs:
             os: ubuntu-latest
           - target: aarch64-unknown-linux-musl
             os: ubuntu-latest
+            use_cross: true
           - target: x86_64-pc-windows-msvc
             os: windows-latest
 
@@ -52,17 +53,9 @@ jobs:
         if: matrix.target == 'x86_64-unknown-linux-musl'
         run: sudo apt-get update && sudo apt-get install -y musl-tools
 
-      - name: Install cross-compilation tools (Linux MUSL ARM64)
+      - name: Install cross (Linux MUSL ARM64)
         if: matrix.target == 'aarch64-unknown-linux-musl'
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y musl-tools gcc-aarch64-linux-gnu musl-dev
-          sudo apt-get install -y gcc-aarch64-linux-gnu
-          # Install aarch64 musl cross-compiler
-          wget -q https://musl.cc/aarch64-linux-musl-cross.tgz
-          tar xzf aarch64-linux-musl-cross.tgz -C /opt
-          echo "/opt/aarch64-linux-musl-cross/bin" >> $GITHUB_PATH
-          echo "CARGO_TARGET_AARCH64_UNKNOWN_LINUX_MUSL_LINKER=aarch64-linux-musl-gcc" >> $GITHUB_ENV
+        run: cargo install cross --git https://github.com/cross-rs/cross
 
       - name: Cache cargo registry
         uses: actions/cache@v4
@@ -75,7 +68,7 @@ jobs:
           restore-keys: release-${{ matrix.target }}-
 
       - name: Build release binary
-        run: cargo build --release --target ${{ matrix.target }} -p uvr
+        run: ${{ matrix.use_cross && 'cross' || 'cargo' }} build --release --target ${{ matrix.target }} -p uvr
 
       - name: Package (Unix)
         if: runner.os != 'Windows'