Dockerfile for a single package/service in a bun monorepo

Dockerfile

FROM oven/bun:latest AS base

WORKDIR /usr/src/app

# install dependencies into a temporary directory to cache them and speed up future builds
FROM base AS install

RUN mkdir -p /temp/dev
COPY . /temp/dev/
RUN cd /temp/dev && bun install --frozen-lockfile --filter ./services/agent-executor

# install with --production to exclude dev dependencies
RUN mkdir -p /temp/prod
COPY .  /temp/prod/
RUN cd /temp/prod && bun install --frozen-lockfile --production --filter ./services/agent-executor

# copy node_modules from temp directory
# then copy all (non-ignored) project files into the image
FROM base AS prerelease
COPY --from=install /temp/dev/node_modules node_modules
COPY . .

# variables; if we're running tests and build scripts it should be here
ENV NODE_ENV=production

# copy production dependencies and source code into the final image
FROM base AS release
COPY --from=install /temp/prod/node_modules node_modules
COPY --from=prerelease /usr/src/app .
COPY --from=prerelease /usr/src/app/package.json .

ENV DEBIAN_FRONTEND=noninteractive
RUN apt update && apt install -y curl && rm -rf /var/lib/apt/lists/*

# run the app
USER bun
ENV PORT=4042
EXPOSE $PORT/tcp

CMD ["bun", "run", "/usr/src/app/services/agent-executor/src/app.ts"]