Add Dockerfile for deploy

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:1.0.25-alpine 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 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 release
+COPY --from=install /temp/dev/node_modules node_modules
+COPY . .
+
+# [optional] tests & build
+ENV NODE_ENV=production
+RUN bun test
+
+# run the app
+USER bun
+EXPOSE 3000/tcp
+ENTRYPOINT [ "bun", "run", "./src/index.ts" ]