fix: add OpenSSL cross-compilation deps for ARM64 Linux CI

The aarch64 cross-build needs libssl-dev:arm64 and pkg-config
configured for cross-compilation since git2 depends on openssl-sys.

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

Author: userFRM

.github/workflows/release.yml

@@ -44,9 +44,15 @@ jobs:
       - name: Install cross-compilation tools
         if: matrix.cross
         run: |
+          sudo dpkg --add-architecture arm64
+          sudo sed -i 's/^deb /deb [arch=amd64] /' /etc/apt/sources.list.d/*.list
+          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 gcc-aarch64-linux-gnu
+          sudo apt-get install -y gcc-aarch64-linux-gnu libssl-dev:arm64
           echo "CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER=aarch64-linux-gnu-gcc" >> $GITHUB_ENV
+          echo "PKG_CONFIG_ALLOW_CROSS=1" >> $GITHUB_ENV
+          echo "PKG_CONFIG_PATH=/usr/lib/aarch64-linux-gnu/pkgconfig" >> $GITHUB_ENV
 
       - name: Build
         run: cargo build --release --target ${{ matrix.target }} ${{ matrix.cargo_flags }}