Use bun to build

Dockerfile

@@ -1,10 +1,37 @@
-FROM node:20
-
+# use the official Bun image
+# see all versions at https://hub.docker.com/r/oven/bun/tags
+FROM oven/bun:1 AS base
 WORKDIR /usr/src/app
-RUN npm install -g pnpm
-COPY package.json pnpm-lock.yaml ./
-RUN pnpm install
 
+# install dependencies into temp directory
+# this will cache them and speed up future builds
+FROM base AS install
+RUN mkdir -p /temp/dev
+COPY package.json bun.lockb /temp/dev/
+RUN cd /temp/dev && bun install --frozen-lockfile
+
+# install with --production (exclude devDependencies)
+RUN mkdir -p /temp/prod
+COPY package.json bun.lockb /temp/prod/
+RUN cd /temp/prod && bun install --frozen-lockfile --production
+
+# 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 . .
 
-CMD ["pnpm", "--silent", "start"]
+# [optional] tests & build
+ENV NODE_ENV=production
+RUN bun test
+RUN bun build src/index.ts --target node --outdir dist
+
+# copy production dependencies and source code into final image
+FROM node:20 AS release
+COPY --from=install /temp/prod/node_modules node_modules
+COPY --from=prerelease /usr/src/app/dist dist
+COPY --from=prerelease /usr/src/app/package.json .
+
+# run the app
+USER node
+ENTRYPOINT [ "node", "dist/index.js" ]