Refactor Docker and Django configuration

- Update Dockerfile to use Python 3.11-slim and optimize build steps
- Remove Dockerfile.prod and update docker-compose.yml
- Remove entrypoint.sh and twilio dependency
- Modify Django settings for production security and configuration
- Update user serializer to include group permissions
- Enhance CSRF and SSL configuration settings

Dockerfile

@@ -3,7 +3,7 @@
 ###########
 
 # pull official base image
-FROM python:3.11.4-slim-buster AS builder
+FROM python:3.11-slim AS builder
 
 # set work directory
 WORKDIR /app
@@ -14,7 +14,9 @@ ENV PYTHONUNBUFFERED 1
 
 # install system dependencies
 RUN apt-get update && \
-    apt-get install -y --no-install-recommends gcc
+    apt-get install -y --no-install-recommends gcc && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
 
 # lint
 RUN pip install --upgrade pip
@@ -30,7 +32,7 @@ RUN pip wheel --no-cache-dir --no-deps --wheel-dir /app/wheels -r requirements.t
 #########
 
 # pull official base image
-FROM python:3.11.4-slim-buster
+FROM python:3.11-slim
 
 # create directory for the app user
 RUN mkdir -p /home/app
@@ -39,15 +41,15 @@ RUN mkdir -p /home/app
 RUN addgroup --system app && adduser --system --group app
 
 # create the appropriate directories
-ENV HOME=/home/app
-ENV APP_HOME=/home/app/api
-RUN mkdir $APP_HOME
-RUN mkdir $APP_HOME/staticfiles
-RUN chmod -R 777 $APP_HOME/staticfiles
-WORKDIR $APP_HOME
+RUN mkdir -p /home/app/api/staticfiles
+RUN chmod -R 777 /home/app/api/staticfiles
+WORKDIR /home/app/api
 
 # install dependencies
-RUN apt-get update && apt-get install -y --no-install-recommends netcat
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends netcat-openbsd && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
 COPY --from=builder /app/wheels /wheels
 COPY --from=builder /app/requirements.txt .
 RUN pip install --upgrade pip
@@ -55,14 +57,14 @@ RUN pip install --no-cache /wheels/*
 
 # copy entrypoint.prod.sh
 COPY ./entrypoint.prod.sh .
-RUN sed -i 's/\r$//g'  $APP_HOME/entrypoint.prod.sh
-RUN chmod +x  $APP_HOME/entrypoint.prod.sh
+RUN sed -i 's/\r$//g'  /home/app/api/entrypoint.prod.sh
+RUN chmod +x  /home/app/api/entrypoint.prod.sh
 
 # copy project
-COPY . $APP_HOME
+COPY . /home/app/api
 
 # chown all the files to the app user
-RUN chown -R app:app $APP_HOME
+RUN chown -R app:app /home/app/api
 
 # change to the app user
 USER app