ci: add ARM64 development libraries for cross-compilation

Co-authored-by: dongwlin <97545700+dongwlin@users.noreply.github.com>

Author: Copilot

.github/workflows/build.yml

@@ -106,7 +106,10 @@ jobs:
       - name: Install ARM64 Cross-Compilation Toolchain
         if: matrix.arch == 'arm64'
         run: |
-          sudo apt-get install -y gcc-aarch64-linux-gnu binutils-aarch64-linux-gnu
+          sudo dpkg --add-architecture arm64
+          sudo apt-get update
+          sudo apt-get install -y gcc-aarch64-linux-gnu binutils-aarch64-linux-gnu \
+            libgtk-3-dev:arm64 libwebkit2gtk-4.1-dev:arm64
 
       - name: Setup Go
         uses: actions/setup-go@v6
@@ -162,6 +165,7 @@ jobs:
       - name: Build wails app
         env:
           CC: ${{ matrix.arch == 'arm64' && 'aarch64-linux-gnu-gcc' || '' }}
+          PKG_CONFIG_PATH: ${{ matrix.arch == 'arm64' && '/usr/lib/aarch64-linux-gnu/pkgconfig' || '' }}
         run: |
           wails build -platform linux/${{ matrix.arch }} -tags webkit2_41