Dockerfile: extract scripts to separate files

scripts/README.md

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+# Docker Build Scripts
+
+This directory contains scripts used by the Dockerfile to build SQLPage with cross-compilation support.
+
+## Scripts
+
+- **`setup-cross-compilation.sh`**: Sets up the cross-compilation environment based on target and build architectures. Handles system dependencies, cross-compiler installation, and libgcc extraction for runtime.
+- **`build-dependencies.sh`**: Builds only the project dependencies for Docker layer caching
+- **`build-project.sh`**: Builds the final SQLPage binary
+
+## Usage
+
+These scripts are automatically copied and executed by the Dockerfile during the build process. They handle:
+
+- Cross-compilation setup for different architectures (amd64, arm64, arm)
+- System dependencies installation
+- Cargo build configuration with appropriate linkers
+- Library extraction for runtime
+
+The scripts use temporary files in `/tmp/` to pass configuration between stages and export environment variables for use in subsequent build steps.

scripts/build-dependencies.sh

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+#!/bin/bash
+set -euo pipefail
+
+# Source the environment variables set by setup-cross-compilation.sh
+TARGET="$(cat /tmp/TARGET)"
+LINKER="$(cat /tmp/LINKER)"
+BINDGEN_EXTRA_CLANG_ARGS="$(cat /tmp/BINDGEN_EXTRA_CLANG_ARGS || true)"
+
+echo "Building dependencies for target: $TARGET"
+
+# Build dependencies only (for Docker layer caching)
+cargo build \
+    --target "$TARGET" \
+    --config "target.$TARGET.linker=\"$LINKER\"" \
+    --features odbc-static \
+    --profile superoptimized

scripts/build-project.sh

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+#!/bin/bash
+set -euo pipefail
+
+# Source the environment variables set by setup-cross-compilation.sh
+TARGET="$(cat /tmp/TARGET)"
+LINKER="$(cat /tmp/LINKER)"
+
+echo "Building project for target: $TARGET"
+
+# Build the project
+touch src/main.rs
+cargo build \
+    --target "$TARGET" \
+    --config "target.$TARGET.linker=\"$LINKER\"" \
+    --features odbc-static \
+    --profile superoptimized
+
+# Move the binary to the expected location
+mv "target/$TARGET/superoptimized/sqlpage" sqlpage.bin

scripts/setup-cross-compilation.sh

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+#!/bin/bash
+set -euo pipefail
+
+TARGETARCH="$1"
+BUILDARCH="$2"
+
+if [ "$TARGETARCH" = "$BUILDARCH" ]; then
+    # Native build
+    rustup target list --installed > /tmp/TARGET
+    echo "gcc" > /tmp/LINKER
+    apt-get install -y gcc libgcc-s1 cmake pkg-config
+
+    LIBDIR="/lib/$(gcc -print-multiarch)"
+
+elif [ "$TARGETARCH" = "arm64" ]; then
+    echo "aarch64-unknown-linux-gnu" > /tmp/TARGET
+    echo "aarch64-linux-gnu-gcc" > /tmp/LINKER
+
+    apt-get update
+    apt-get install -y gcc-aarch64-linux-gnu libgcc-s1-arm64-cross pkg-config
+
+    LIBDIR="/usr/aarch64-linux-gnu/lib"
+
+    # Also install gcc for aarch64 to get libgcc
+    apt-get install -y gcc-aarch64-linux-gnu
+
+elif [ "$TARGETARCH" = "arm" ]; then
+    echo "armv7-unknown-linux-gnueabihf" > /tmp/TARGET
+    echo "arm-linux-gnueabihf-gcc" > /tmp/LINKER
+
+    apt-get update
+    apt-get install -y gcc-arm-linux-gnueabihf libgcc-s1-armhf-cross cmake libclang1 clang pkg-config
+
+    # Ensure gcc-arm-linux-gnueabihf is available
+    apt-get install -y gcc-arm-linux-gnueabihf
+
+    cargo install --force --locked bindgen-cli
+
+    SYSROOT=$(arm-linux-gnueabihf-gcc -print-sysroot)
+    echo "--sysroot=$SYSROOT -I$SYSROOT/usr/include -I$SYSROOT/usr/include/arm-linux-gnueabihf" > /tmp/BINDGEN_EXTRA_CLANG_ARGS
+
+    LIBDIR="/usr/arm-linux-gnueabihf/lib"
+else
+    echo "Unsupported cross compilation target: $TARGETARCH"
+    exit 1
+fi
+
+# Copy libgcc_s.so.1 for runtime
+mkdir -p /tmp/sqlpage-libs
+
+cp "$LIBDIR/libgcc_s.so.1" /tmp/sqlpage-libs/
+
+# Add the target
+rustup target add "$(cat /tmp/TARGET)"
+