add dockerfile for hosting purposes

Dockerfile

@@ -0,0 +1,30 @@
+FROM oven/bun:alpine AS base
+
+WORKDIR /app
+
+COPY package.json bun.lock ./
+
+RUN bun install -p
+
+FROM base AS build
+
+WORKDIR /app
+
+ARG DATABASE_URL
+
+COPY --from=base /app/node_modules ./node_modules
+
+COPY . .
+
+RUN bun install
+RUN bun run build
+
+FROM base AS production
+
+ENV NODE_ENV production
+
+COPY --from=build /app/build .
+
+EXPOSE 3000
+ENV PORT 3000
+CMD ["bun", "run", "./index.js"]