feat: Implement cross-compilation and Docker layer caching for ARM builds

Author: code-inflation

.github/workflows/CI.yml

@@ -36,10 +36,27 @@ jobs:
       - uses: actions/checkout@v4
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
+        with:
+          driver-opts: |
+            image=moby/buildkit:master
+      - name: Cache Docker layers
+        uses: actions/cache@v4
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-
       - name: Build and push Docker image
         uses: docker/build-push-action@v5
+        with:
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache-new,mode=max
         with:
           platforms: linux/amd64,linux/arm64
           push: false
           tags: |
             cybuerg/cfspeedtest:${{ github.sha }}
+    - name: Move cache
+      run: |
+        rm -rf /tmp/.buildx-cache
+        mv /tmp/.buildx-cache-new /tmp/.buildx-cache

Dockerfile

@@ -1,8 +1,26 @@
 FROM rust:slim-bullseye as builder
 WORKDIR /usr/src/cfspeedtest
+
+# Add cross-compilation support
+ARG TARGETPLATFORM
+RUN echo "Building for $TARGETPLATFORM" && \
+    if [ "$TARGETPLATFORM" = "linux/arm64" ]; then \
+        apt-get update && \
+        apt-get install -y --no-install-recommends \
+            gcc-aarch64-linux-gnu \
+            binutils-aarch64-linux-gnu && \
+        rustup target add aarch64-unknown-linux-gnu && \
+        rm -rf /var/lib/apt/lists/*; \
+    fi
+
 COPY Cargo.toml Cargo.lock ./
 COPY src ./src
-RUN cargo install --path .
+
+# Set up cross-compilation environment
+ENV CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER=aarch64-linux-gnu-gcc
+ARG CARGO_BUILD_FLAGS=""
+RUN if [ "$TARGETPLATFORM" = "linux/arm64" ]; then export CARGO_BUILD_FLAGS="--target aarch64-unknown-linux-gnu"; fi && \
+    cargo install --path . $CARGO_BUILD_FLAGS
 
 FROM debian:bullseye-slim
 RUN apt-get update && apt-get install -y --no-install-recommends tini && rm -rf /var/lib/apt/lists/*