chore: use slim version of base image (#74)

Use slim version of base image.

Author: oioki

Dockerfile

@@ -1,13 +1,13 @@
 # Build stage
-FROM python:3.11 AS builder
+FROM python:3.11-slim AS builder
 RUN pip install -U pip setuptools wheel
 # Copy files
 COPY requirements.frozen.txt /project/
 WORKDIR /project
 RUN pip install --no-cache-dir -r requirements.frozen.txt
 
 # Execution stage
-FROM python:3.11
+FROM python:3.11-slim
 WORKDIR /app
 COPY src/ /project/src
 # Retrieve packages from build stage