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docker/shulker/Dockerfile

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+# Build Shulker without modifying the submodule; run as non-root; persist config and read logs via volumes
+FROM node:22-alpine AS build
+
+WORKDIR /app
+
+# Enable corepack so yarn is available (Node 18+)
+RUN corepack enable
+
+# Copy only dependency manifests first for better layer caching
+COPY external/shulker/package.json external/shulker/yarn.lock ./external/shulker/
+
+WORKDIR /app/external/shulker
+
+# Install dependencies
+RUN yarn install --frozen-lockfile || yarn install
+
+# Copy source and build
+COPY external/shulker/ /app/external/shulker/
+RUN yarn build
+
+FROM node:22-alpine
+
+WORKDIR /app
+
+# Copy built app from builder
+COPY --from=build /app/external/shulker /app
+
+# Prepare runtime directories and non-root user
+RUN adduser -D -h /app -u 10001 shulker \
+    && mkdir -p /data /minecraft/logs \
+    && chown -R shulker:shulker /app /data /minecraft
+
+# Copy entrypoint
+COPY docker/shulker/entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
+# Install helpful runtime tools
+RUN apk add --no-cache jq
+
+USER shulker
+
+# Shulker default port
+EXPOSE 8000
+
+# Volumes: /data holds config.json, /minecraft/logs maps to the server logs
+VOLUME ["/data", "/minecraft/logs"]
+
+ENTRYPOINT ["/entrypoint.sh"]
+CMD ["node", "build/index.js"]