Optimize Docker image size with multi-stage build

Dockerfile

@@ -1,15 +1,27 @@
 # syntax=docker/dockerfile:1
-FROM node:lts-alpine3.23
 
-LABEL org.opencontainers.image.source=https://github.com/chorrell/docker-json
+# Build stage - install dependencies
+FROM node:lts-alpine3.23 AS builder
 
 ARG MAJOR_VERSION=11
 
 RUN set -ex \
     && npm install -g json@^$MAJOR_VERSION.0.0
 
-COPY --link docker-entrypoint.sh /usr/local/bin/
+# Minimal runtime stage - use alpine base and copy only Node binary
+FROM alpine:3.23
+
+LABEL org.opencontainers.image.source=https://github.com/chorrell/docker-json
+
+# Copy only the Node binary and essential libraries from builder
+COPY --from=builder /usr/local/bin/node /usr/local/bin/node
+COPY --from=builder /usr/lib/libstdc++.so.6 /usr/lib/libstdc++.so.6
+COPY --from=builder /usr/lib/libgcc_s.so.1 /usr/lib/libgcc_s.so.1
+
+# Copy only the json package (no dependencies)
+COPY --from=builder /usr/local/lib/node_modules/json /usr/local/lib/node_modules/json
 
-ENTRYPOINT ["docker-entrypoint.sh"]
+# Use node to run json.js directly
+ENTRYPOINT ["/usr/local/bin/node", "/usr/local/lib/node_modules/json/lib/json.js"]
 
 CMD ["--version"]