fix: release workflow not uploading binary assets (fixes #56)

Root cause: softprops/action-gh-release@v2 silently failed when the
release already existed (created by release-please via GITHUB_TOKEN).

Changes:
- Replace softprops/action-gh-release with gh release upload --clobber
- Add aarch64-unknown-linux-gnu (Linux ARM64) to build matrix
- Add cross-compilation setup for ARM64 (gcc-aarch64-linux-gnu + ALSA)
- Add error logging for tag resolution and artifact listing

Author: pszymkowiak

.github/workflows/release.yml

@@ -42,6 +42,12 @@ jobs:
             features: ""
             archive: tar.gz
             deps: libasound2-dev
+          - target: aarch64-unknown-linux-gnu
+            os: ubuntu-latest
+            features: ""
+            archive: tar.gz
+            cross: true
+            deps: gcc-aarch64-linux-gnu libc6-dev-arm64-cross
           - target: x86_64-pc-windows-msvc
             os: windows-latest
             features: ""
@@ -58,10 +64,36 @@ jobs:
 
       - name: Install system deps (Linux)
         if: matrix.deps != ''
-        run: sudo apt-get update && sudo apt-get install -y ${{ matrix.deps }}
+        run: |
+          sudo dpkg --add-architecture arm64 || true
+          sudo apt-get update
+          sudo apt-get install -y ${{ matrix.deps }}
+
+      - name: Install ALSA cross-compile deps (Linux ARM64)
+        if: matrix.cross == true
+        run: |
+          # Add arm64 architecture and install cross-compile ALSA
+          sudo dpkg --add-architecture arm64
+          # Add arm64 package sources
+          sudo sed -i 's/^deb /deb [arch=amd64] /' /etc/apt/sources.list.d/*.list || true
+          echo "deb [arch=arm64] http://ports.ubuntu.com/ $(lsb_release -cs) main restricted universe" | sudo tee /etc/apt/sources.list.d/arm64.list
+          echo "deb [arch=arm64] http://ports.ubuntu.com/ $(lsb_release -cs)-updates main restricted universe" | sudo tee -a /etc/apt/sources.list.d/arm64.list
+          sudo apt-get update
+          sudo apt-get install -y libasound2-dev:arm64
+        env:
+          PKG_CONFIG_ALLOW_CROSS: 1
+
+      - name: Build (native)
+        if: matrix.cross != true
+        run: cargo build --release --target ${{ matrix.target }} ${{ matrix.features != '' && format('--features {0}', matrix.features) || '' }}
 
-      - name: Build
+      - name: Build (cross)
+        if: matrix.cross == true
         run: cargo build --release --target ${{ matrix.target }} ${{ matrix.features != '' && format('--features {0}', matrix.features) || '' }}
+        env:
+          CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER: aarch64-linux-gnu-gcc
+          PKG_CONFIG_ALLOW_CROSS: 1
+          PKG_CONFIG_PATH: /usr/lib/aarch64-linux-gnu/pkgconfig
 
       - name: Package (tar.gz)
         if: matrix.archive == 'tar.gz'
@@ -85,44 +117,46 @@ jobs:
           path: vox-${{ matrix.target }}.${{ matrix.archive }}
 
   release:
-    name: Create Release
+    name: Upload Release Assets
     needs: [build]
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-
       - name: Download all artifacts
         uses: actions/download-artifact@v4
         with:
           path: artifacts
 
-      - name: Get version
+      - name: Get tag
         id: version
         run: |
           TAG="${{ inputs.tag }}"
           if [ -z "$TAG" ]; then
             TAG="${{ github.event.release.tag_name }}"
           fi
-          echo "version=$TAG" >> $GITHUB_OUTPUT
+          if [ -z "$TAG" ]; then
+            echo "::error::No tag found"
+            exit 1
+          fi
+          echo "tag=$TAG" >> $GITHUB_OUTPUT
 
       - name: Flatten artifacts
         run: |
           mkdir -p release
           find artifacts -type f \( -name "*.tar.gz" -o -name "*.zip" \) -exec cp {} release/ \;
+          echo "=== Release assets ==="
+          ls -lh release/
 
       - name: Create checksums
         run: |
           cd release
           sha256sum * > checksums.txt
+          cat checksums.txt
 
-      - name: Upload Release Assets
-        uses: softprops/action-gh-release@v2
-        with:
-          tag_name: ${{ steps.version.outputs.version }}
-          files: release/*
+      - name: Upload to existing release
+        run: gh release upload "$TAG" release/* --clobber --repo "${{ github.repository }}"
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          TAG: ${{ steps.version.outputs.tag }}
 
   homebrew:
     name: Update Homebrew formula