ci: use native ARM runner for faster Linux ARM builds

Switch from cross-compilation on x86_64 to native ARM runner, which improves build speed and reliability for Linux ARM binary distribution.

.github/workflows/publish.yml

@@ -103,7 +103,7 @@ jobs:
             target: x86_64-pc-windows-msvc
           - host: blacksmith-4vcpu-ubuntu-2404
             target: x86_64-unknown-linux-gnu
-          - host: blacksmith-4vcpu-ubuntu-2404
+          - host: blacksmith-8vcpu-ubuntu-2404-arm
             target: aarch64-unknown-linux-gnu
     runs-on: ${{ matrix.settings.host }}
     steps:
@@ -148,12 +148,6 @@ jobs:
           sudo apt-get update
           sudo apt-get install -y libwebkit2gtk-4.1-dev libappindicator3-dev librsvg2-dev patchelf
 
-      - name: install cross toolchain (aarch64)
-        if: matrix.settings.target == 'aarch64-unknown-linux-gnu'
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y gcc-aarch64-linux-gnu g++-aarch64-linux-gnu libc6-dev-arm64-cross
-
       - name: install Rust stable
         uses: dtolnay/rust-toolchain@stable
         with:
@@ -198,8 +192,6 @@ jobs:
           releaseAssetNamePattern: opencode-desktop-[platform]-[arch][ext]
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER: ${{ matrix.settings.target == 'aarch64-unknown-linux-gnu' && 'aarch64-linux-gnu-gcc' || '' }}
-          PKG_CONFIG_ALLOW_CROSS: ${{ matrix.settings.target == 'aarch64-unknown-linux-gnu' && '1' || '' }}
           TAURI_BUNDLER_NEW_APPIMAGE_FORMAT: true
           TAURI_SIGNING_PRIVATE_KEY: ${{ secrets.TAURI_SIGNING_PRIVATE_KEY }}
           TAURI_SIGNING_PRIVATE_KEY_PASSWORD: ${{ secrets.TAURI_SIGNING_PRIVATE_KEY_PASSWORD }}