Add Debian-based example to BestPractices for removing npm & Yarn from Docker image

[MikeMcC399]

@tback

Here is an example Dockerfile for node:24-trixie-slim. It hasn't been otherwise posted or reviewed, so please use with caution. It should at least give you an idea of how it can be done. It's based on the Alpine example previously mentioned.

FROM node:24-trixie-slim AS builder
WORKDIR /build-stage
COPY package*.json ./
RUN npm ci
# Copy the the files you need
COPY . ./
RUN npm run build

FROM debian:trixie-slim
# Create app directory
WORKDIR /usr/src/app
# Add required binaries
RUN apt-get update && apt-get install -y --no-install-recommends dumb-init \
    && rm -rf /var/lib/apt/lists/* \
    && groupadd --gid 1000 node \
    && useradd --uid 1000 --gid node --shell /bin/bash --create-home node \
    && chown node:node ./
COPY --from=builder /usr/local/bin/node /usr/local/bin/
COPY --from=builder /usr/local/bin/docker-entrypoint.sh /usr/local/bin/
ENTRYPOINT ["docker-entrypoint.sh"]
USER node
# Update the following COPY lines based on your codebase
COPY --from=builder /build-stage/node_modules ./node_modules
COPY --from=builder /build-stage/dist ./dist
# Run with dumb-init to not start node with PID=1, since Node.js was not designed to run as PID 1
CMD ["dumb-init", "node", "dist/index.js"]

Originally posted by @MikeMcC399 in #404

[MikeMcC399]

This example should be added to the documentation section Smaller images without npm/yarn to complement the existing Alpine example.

[MikeMcC399]

See PR #2454 which adds a Debian example where npm and Yarn are removed from the image