Fix bugs, add README and Makefile

Dockerfile

@@ -4,13 +4,14 @@ WORKDIR /app
 
 RUN pip install uv && apt update && apt install -y git
 COPY pyproject.toml uv.lock README.md /app
-COPY birthday_pool_bot /app
+RUN uv sync
+COPY birthday_pool_bot /app/birthday_pool_bot
 ENTRYPOINT ["uv", "run"]
 
 
 FROM core AS app
 
-RUN uv sync --group sqlite
+RUN uv sync --group sqlite --group postgresql
 ENTRYPOINT ["uv", "run", "python", "-m", "birthday_pool_bot"]