Add aarch64 build job to CI workflow

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: juntao

.github/workflows/rust_ci.yml

@@ -41,3 +41,48 @@ jobs:
 
       - name: Build binary
         run: cargo build --release
+
+  build-aarch64:
+    name: Build (aarch64)
+    runs-on: ubuntu-latest
+    container:
+      image: debian:bookworm-slim
+    steps:
+      - name: Install base dependencies
+        shell: bash
+        run: |
+          set -euo pipefail
+          export DEBIAN_FRONTEND=noninteractive
+          dpkg --add-architecture arm64
+          apt-get update
+          apt-get install -y --no-install-recommends \
+            ca-certificates \
+            pkg-config \
+            libssl-dev \
+            libssl-dev:arm64 \
+            gcc-aarch64-linux-gnu \
+            libc6-dev-arm64-cross \
+            build-essential \
+            git \
+            curl \
+            unzip \
+            cmake
+
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Set up Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Add Rust target
+        run: rustup target add aarch64-unknown-linux-gnu
+
+      - name: Build binary
+        env:
+          CC_aarch64_unknown_linux_gnu: aarch64-linux-gnu-gcc
+          AR_aarch64_unknown_linux_gnu: aarch64-linux-gnu-ar
+          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
+          RUSTFLAGS: "-C target-feature=+fp16"
+        run: cargo build --release --target aarch64-unknown-linux-gnu