Refactor to improve portability and robustness

This commit implements a small refactor to make the dev container setup
more resilient and truly multi-platform.

- Installs `aarch64` cross-compilation packages (`gcc-aarch64-linux-gnu`,
  `libc6-dev-arm64-cross`) in the `Dockerfile` to enable building for
   ARM64 on x86_64 hosts.
- Updates `bin/build-arch` to use the correct `strip` binary (native or
  cross-compile) by checking both the host and target architectures.
- Adds a 30-second timeout to the `postCreate` script to prevent it from
  hanging if the Docker daemon fails to start.
- Adds a comment to `bin/test` clarifying why language runtime tests are
  now enabled for all architectures.
- Merges the `update-alternatives` command into the main `RUN` layer,
  reducing the total number of image layers.

Author: brcarp

.devcontainer/Dockerfile

@@ -3,22 +3,32 @@ FROM mcr.microsoft.com/devcontainers/rust:2-1-bookworm
 RUN apt-get update -y \
     && apt-get upgrade -y \
     && apt-get install -y --fix-missing --no-install-recommends \
+    \
+    # Zip for packaging
     zip \
+    \
+    # QEMU for multi-architecture support
     qemu-system \
     binfmt-support \
     qemu-user-static \
+    \
+    # Language runtimes for tests
     nodejs \
     ruby \
     php \
     php-common \
     python3-pip \
+    \
+    # Cross-compilation toolchains
     gcc-x86-64-linux-gnu \
     libc6-dev-amd64-cross \
+    gcc-aarch64-linux-gnu \
+    libc6-dev-arm64-cross \
+    \
+    # Clean up, enable QEMU, and set Python alternative in a single layer
     && rm -rf /var/lib/apt/lists/* \
-    && update-binfmts --enable qemu-aarch64
-
-# Easy way to install Python.
-RUN update-alternatives --install /usr/bin/python python /usr/bin/python3 1
+    && update-binfmts --enable qemu-aarch64 \
+    && update-alternatives --install /usr/bin/python python /usr/bin/python3 1
 
 # Switch to root to install rust targets and fix permissions
 USER root

.devcontainer/postCreate

@@ -2,7 +2,13 @@
 set -e
 
 # Wait for docker to be ready
+TIMEOUT=30
 while ! docker info > /dev/null 2>&1; do
     echo "Waiting for docker daemon..."
     sleep 1
+    TIMEOUT=$((TIMEOUT - 1))
+    if [ $TIMEOUT -le 0 ]; then
+        echo "Docker daemon failed to start"
+        exit 1
+    fi
 done 

bin/build-arch

@@ -19,11 +19,25 @@ cp "./target/${CRYPTEIA_BUILD_TARGET}/release/crypteia" "./build/${BIN}"
 cp "./target/${CRYPTEIA_BUILD_TARGET}/release/libcrypteia.so" "./build/${LIB}"
 
 cd ./build
-if [ "${CRYPTEIA_BUILD_TARGET}" = "aarch64-unknown-linux-gnu" ]; then
-  strip "$BIN"
-else
-  x86_64-linux-gnu-strip "$BIN"
-fi
+
+# Use appropriate strip command based on target
+case "${CRYPTEIA_BUILD_TARGET}" in
+  aarch64-unknown-linux-gnu)
+    if [ "$(uname -m)" = "aarch64" ]; then
+      strip "$BIN"
+    else
+      aarch64-linux-gnu-strip "$BIN" 2>/dev/null || strip "$BIN"
+    fi
+    ;;
+  x86_64-unknown-linux-gnu)
+    if [ "$(uname -m)" = "x86_64" ]; then
+      strip "$BIN"
+    else
+      x86_64-linux-gnu-strip "$BIN" 2>/dev/null || strip "$BIN"
+    fi
+    ;;
+esac
+
 chmod +x "$BIN"
 zip -r "${BIN}.zip" "$BIN"
 zip -r "libcrypteia-${CRYPTEIA_BUILD_OS}${CRYPTEIA_BUILD_SUFFIX}.zip" "$LIB"

bin/test

@@ -28,6 +28,8 @@ if [ ! "${SKIP_CARGO_TEST}" = "1" ]; then
   cargo test --target "${CRYPTEIA_BUILD_TARGET}" --quiet
 fi
 
+# Language runtime tests now work on both architectures thanks to proper
+# LD_PRELOAD path matching (CRYPTEIA_BUILD_SUFFIX) and installed runtimes
 TEST_LANG=node ./test/libcrypteia.sh
 TEST_LANG=ruby ./test/libcrypteia.sh
 TEST_LANG=php ./test/libcrypteia.sh