deploy: add Docker and Caddy production stack

Dockerfile

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+ARG BUN_IMAGE=oven/bun:1.3.14@sha256:e10577f0db68676a7024391c6e5cb4b879ebd17188ab750cf10024a6d700e5c4
+FROM ${BUN_IMAGE} AS build
+WORKDIR /app
+COPY package.json bun.lock bunfig.toml ./
+RUN bun install --frozen-lockfile
+COPY . .
+RUN bun run build
+
+FROM ${BUN_IMAGE} AS dependencies
+WORKDIR /app
+COPY package.json bun.lock bunfig.toml ./
+RUN bun install --frozen-lockfile --production
+
+FROM ${BUN_IMAGE} AS runtime
+WORKDIR /app
+RUN apt-get update && apt-get install -y --no-install-recommends fonts-dejavu-core ca-certificates && rm -rf /var/lib/apt/lists/*
+COPY --from=dependencies /app/node_modules ./node_modules
+COPY --from=build /app/dist ./dist
+COPY --from=build /app/src ./src
+COPY --from=build /app/scripts ./scripts
+COPY --from=build /app/drizzle ./drizzle
+COPY package.json bunfig.toml ./
+ENV NODE_ENV=production HOST=0.0.0.0 PORT=3000 DATABASE_PATH=/data/minabot.sqlite
+USER bun
+EXPOSE 3000
+CMD ["sh", "-c", "bun scripts/migrate.ts && exec bun scripts/start.ts"]