Craziness with multiarch

source/Dockerfile.multiarch

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+# syntax=docker/dockerfile:1.4
+FROM --platform=$BUILDPLATFORM alpine:3.19 AS deps
+
+# Install build dependencies
+RUN apk add --no-cache \
+    build-base \
+    cmake \
+    git \
+    linux-headers \
+    musl-dev \
+    zlib-dev \
+    bzip2-dev \
+    xz-dev \
+    zstd-dev \
+    curl \
+    bash \
+    gcc \
+    g++ \
+    libstdc++ \
+    libstdc++-dev \
+    ccache \
+    ninja
+
+FROM deps AS build
+
+ARG TARGETARCH
+WORKDIR /source
+COPY . .
+
+# Create and run build script
+RUN printf '#!/bin/bash\n\
+set -e\n\
+echo "Setting up build directory..."\n\
+mkdir -p /build/ccache\n\
+mkdir -p /build/build_${TARGETARCH}\n\
+\n\
+echo "Setting up ccache..."\n\
+export CCACHE_DIR=/build/ccache\n\
+export CCACHE_MAXSIZE=2G\n\
+export PATH="/usr/lib/ccache/bin:$PATH"\n\
+\n\
+echo "Running CMake configuration..."\n\
+cd /build/build_${TARGETARCH}\n\
+cmake /source -G Ninja -DCMAKE_BUILD_TYPE=Release \
+    -DCMAKE_FIND_LIBRARY_SUFFIXES=".a" \
+    -DBUILD_SHARED_LIBS=OFF \
+    -DCMAKE_C_COMPILER_LAUNCHER=ccache \
+    -DCMAKE_CXX_COMPILER_LAUNCHER=ccache 2>&1 | tee cmake.log\n\
+\n\
+echo "Starting build..."\n\
+ninja -v -j$(nproc) 2>&1 | tee build.log\n\
+\n\
+echo "Build complete. Checking for binary..."\n\
+if [ ! -f dropshell ]; then\n\
+    echo "Build failed. Directory contents:"\n\
+    ls -la\n\
+    echo "CMake log:"\n\
+    cat cmake.log\n\
+    echo "Build log:"\n\
+    cat build.log\n\
+    exit 1\n\
+fi\n\
+\n\
+echo "ccache stats:"\n\
+ccache -s\n' > /source/docker_build.sh && chmod +x /source/docker_build.sh && /source/docker_build.sh
+
+# Final stage: copy out the binary
+FROM scratch AS export-stage
+ARG TARGETARCH
+COPY --from=build /build/build_${TARGETARCH}/dropshell /dropshell