Use alpine instead of python:3-slim for lighter image

Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3-slim
+FROM python:3-alpine
 
 # Upgrade pip to latest version
 RUN pip install --no-cache-dir --upgrade pip
@@ -15,23 +15,23 @@ ENV DOCKER_CHANNEL=stable
 ENV DOCKER_VERSION=27.5.1
 
 # Install required packages and Docker CLI
-RUN apt-get update && \
-    apt-get install -y --no-install-recommends \
+RUN apk add --no-cache \
         iptables \
         wget \
         ca-certificates \
-        git && \
-    update-alternatives --set iptables /usr/sbin/iptables-legacy && \
-    rm -rf /var/lib/apt/lists/* && \
+        git \
+        bash && \
+    update-ca-certificates && \
     wget -q -O - "https://download.docker.com/linux/static/${DOCKER_CHANNEL}/x86_64/docker-${DOCKER_VERSION}.tgz" | \
     tar -xzC /usr/local/bin/ --strip-components 1 && \
-    addgroup --system dockremap && \
-    adduser --system --ingroup dockremap dockremap && \
+    addgroup -S dockremap && \
+    adduser -S -G dockremap dockremap && \
     echo 'dockremap:165536:65536' >> /etc/subuid && \
     echo 'dockremap:165536:65536' >> /etc/subgid
 
 # Copy the entrypoint script
 COPY entrypoint.sh /usr/local/bin/
+RUN chmod +x /usr/local/bin/entrypoint.sh
 
 # volume declaration for Docker data
 VOLUME ["/var/lib/docker"]