optimize dockerfile (#238)

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3
+FROM python:3.12-slim
 
 # Add labels to describe the Docker image
 LABEL org.opencontainers.image.description="The image includes all the necessary dependencies and configurations to run Ikabot seamlessly."
@@ -9,9 +9,11 @@ WORKDIR /ikabot
 COPY . .
 
 # Install dependencies
-RUN pip install --upgrade pip
-RUN pip install -e .
-RUN apt-get update
-RUN apt-get install dnsutils -y
+RUN pip install --no-cache-dir --upgrade pip && \
+    pip install --no-cache-dir -e .
+RUN apt-get update && \ 
+    apt-get install --no-install-recommends dnsutils -y && \
+    apt-get clean  && \
+    rm -rf /var/lib/apt/lists/*
 
-CMD "python3" "-m" "ikabot"
+CMD ["python3", "-m", "ikabot"]