Add dockerfile

Dockerfile

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+# 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
+
+# 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
+RUN mkdir -p /temp/prod
+COPY package.json bun.lockb /temp/prod/
+RUN cd /temp/prod && bun install --frozen-lockfile
+
+# 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 . .
+
+# Env vars
+ENV NODE_ENV=production
+
+# copy production dependencies and source code into final image
+FROM base AS release
+COPY --from=prerelease /usr/src/app .
+COPY --from=install /temp/dev/node_modules node_modules
+COPY --from=prerelease /usr/src/app/public public
+
+# run the app
+USER bun
+EXPOSE 3000/tcp
+WORKDIR /usr/src/app
+ENV PORT=3000
+ENTRYPOINT ["bun", "run", "src/server.tsx"]