🔧 Configure ARM64 cross-compilation for CI/CD

Fix OpenSSL dependency issues for ARM64 builds in GitHub Actions

- Add ARM64 architecture support with dpkg --add-architecture arm64
- Install libssl-dev:arm64 for OpenSSL development headers
- Configure PKG_CONFIG_ALLOW_CROSS=1 for cross-compilation
- Set PKG_CONFIG_PATH to ARM64 library location
- Add pkg-config package to toolchain dependencies

Resolves build failures when cross-compiling to aarch64-unknown-linux-gnu
target due to missing OpenSSL libraries and improper pkg-config setup.

Author: hyperb1iss

.github/workflows/cicd.yml

@@ -185,9 +185,23 @@ jobs:
         if: matrix.target == 'aarch64-unknown-linux-gnu'
         run: |
           sudo apt-get update
-          sudo apt-get install -y gcc-aarch64-linux-gnu
+          # Enable arm64 packages and add ports.ubuntu.com sources (Azure mirror lacks arm64).
+          sudo dpkg --add-architecture arm64
+          echo "deb [arch=arm64] http://ports.ubuntu.com/ubuntu-ports noble main restricted universe multiverse" | sudo tee    /etc/apt/sources.list.d/ubuntu-ports.list
+          echo "deb [arch=arm64] http://ports.ubuntu.com/ubuntu-ports noble-updates main restricted universe multiverse" | sudo tee -a /etc/apt/sources.list.d/ubuntu-ports.list
+          echo "deb [arch=arm64] http://ports.ubuntu.com/ubuntu-ports noble-security main restricted universe multiverse" | sudo tee -a /etc/apt/sources.list.d/ubuntu-ports.list
+          echo "deb [arch=arm64] http://ports.ubuntu.com/ubuntu-ports noble-backports main restricted universe multiverse" | sudo tee -a /etc/apt/sources.list.d/ubuntu-ports.list
+
+          # Refresh package lists (retry up to 3 times)
+          sudo apt-get -o Acquire::Retries=3 update
+
+          # Install cross-compiler, OpenSSL (ARM64) and pkg-config
+          sudo apt-get install -y --no-install-recommends gcc-aarch64-linux-gnu libssl-dev:arm64 pkg-config
           echo "CC_aarch64_unknown_linux_gnu=aarch64-linux-gnu-gcc" >> $GITHUB_ENV
           echo "CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER=aarch64-linux-gnu-gcc" >> $GITHUB_ENV
+          # Configure pkg-config for cross-compilation
+          echo "PKG_CONFIG_ALLOW_CROSS=1" >> $GITHUB_ENV
+          echo "PKG_CONFIG_PATH=/usr/lib/aarch64-linux-gnu/pkgconfig" >> $GITHUB_ENV
 
       - name: 📦 Rust cache
         uses: Swatinem/rust-cache@v2