fix(docker): split RUN steps to fix Node.js install on multi-platform build (#108)

Separate apt-get install from Node.js download into two RUN layers.
The piped curl|tar command fails with 404 when ca-certificates from
apt layer is not yet available during parallel multi-platform build.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Dockerfile

@@ -8,11 +8,16 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     curl \
     make \
     g++ \
-    && ARCH=$(dpkg --print-architecture) \
-    && curl -fsSL "https://nodejs.org/dist/v23.11.0/node-v23.11.0-linux-${ARCH}.tar.gz" \
-       | tar -xz -C /usr/local --strip-components=1 \
     && rm -rf /var/lib/apt/lists/*
 
+RUN ARCH=$(dpkg --print-architecture) \
+    && echo "Downloading Node.js v23.11.0 for ${ARCH}" \
+    && curl -fsSL "https://nodejs.org/dist/v23.11.0/node-v23.11.0-linux-${ARCH}.tar.gz" \
+       -o /tmp/node.tar.gz \
+    && tar -xzf /tmp/node.tar.gz -C /usr/local --strip-components=1 \
+    && rm -f /tmp/node.tar.gz \
+    && node --version
+
 WORKDIR /app
 
 COPY package*.json ./