Refactor Dockerfile to streamline AWS CLI installation and improve layer caching

Dockerfile

@@ -1,8 +1,11 @@
 FROM python:3.11-slim
+
 WORKDIR /app
-COPY . /app
 
-RUN apt update -y && apt install awscli -y
+COPY requirements.txt .
+
+RUN pip install --no-cache-dir -r requirements.txt awscli
+
+COPY . .
 
-RUN apt-get update && pip install -r requirements.txt
-CMD ["python3", "app.py"]
+CMD ["python", "app.py"]