add dockerfile

spec/DOCKER_INSTRUCTIONS.md

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+# Dockerization Task: Lightweight Bun + Hono Container
+
+## 1. Objective
+Create a production-ready `Dockerfile` and a `.dockerignore` file for the current Bun + Hono + SQLite application.
+
+## 2. Performance & Resource Goals
+- **Concurrency:** The container must comfortably handle simultaneous requests (4-5 concurrent connections is the baseline, but it should handle more efficiently). Rely on Bun's native asynchronous event loop.
+- **Memory Footprint:** The image size and runtime memory usage must be **minimized**.
+- **Security:** Do not run as root if possible, or ensure the environment is restricted.
+
+## 3. Technical Requirements
+
+### A. Base Image
+- Use `oven/bun:1-alpine` as the base image.
+- **Reason:** The Alpine variant is significantly smaller than the Debian-based default, satisfying the low-memory/storage requirement.
+
+### B. Build Instructions
+1.  **Environment:** Set `NODE_ENV=production`.
+2.  **Dependencies:** Run `bun install --frozen-lockfile --production`. Do not install `devDependencies` (like types or test runners) to keep the image small.
+3.  **Database Directory:** Create a dedicated directory for the SQLite database (e.g., `/app/data`).
+4.  **Volume:** Declare a `VOLUME` for the database directory so data persists after container restarts.
+
+### C. Runtime Configuration
+1.  **Port:** Expose the port (usually 3000).
+2.  **Command:** Use `bun run src/index.ts` (or the entry point file).
+3.  **Binding:** Ensure the Hono app listens on `0.0.0.0` (not `127.0.0.1` or `localhost`), otherwise it will not be accessible outside the container.
+
+### D. The `.dockerignore` file
+Create a strict `.dockerignore` to prevent unnecessary files from increasing the build context size. Exclude:
+- `node_modules`
+- `*.db` (Local database files should not be copied into the image)
+- `.git`
+- `python-ref`
+- `*.md`
+
+## 4. Deliverables
+Please generate the code for:
+1.  `Dockerfile`
+2.  `.dockerignore`