idhub: optimize size

applies optimizations because use of: apt, pip (python)

debian:bookworm-slim 1.21GB
python:3.11.7-slim-bookworm 880 MiB

docker/idhub.Dockerfile

@@ -1,23 +1,33 @@
-FROM debian:bookworm-slim
+FROM python:3.11.7-slim-bookworm
 
 # last line is dependencies for weasyprint (for generating pdfs in lafede pilot) https://doc.courtbouillon.org/weasyprint/stable/first_steps.html#debian-11
-RUN apt update &&  apt-get install -y \
-    python3-minimal \
-    python3-pip \
-    python3-dev \
-    python-is-python3 \
+RUN apt update && \
+    apt-get install -y \
     git \
     sqlite3 \
     jq \
-    python3-pip python3-cffi python3-brotli libpango-1.0-0 libpangoft2-1.0-0
+    libpango-1.0-0 libpangoft2-1.0-0 \
+      && pip install cffi brotli \
+    && rm -rf /var/lib/apt/lists/*
 
 WORKDIR /opt/idhub
 
-RUN python3 -m pip install --upgrade pip --break-system-packages
+# reduce size (python specifics) -> src https://stackoverflow.com/questions/74616667/removing-pip-cache-after-installing-dependencies-in-docker-image
+ENV PYTHONDONTWRITEBYTECODE=1
+# here document in dockerfile src https://stackoverflow.com/questions/40359282/launch-a-cat-command-unix-into-dockerfile
+RUN cat > /etc/pip.conf <<END
+[install]
+compile = no
+
+[global]
+no-cache-dir = True
+END
+
+RUN pip install --upgrade pip
 
 COPY ssikit_trustchain/didkit-0.3.2-cp311-cp311-manylinux_2_34_x86_64.whl /opt/idhub
 COPY IdHub/requirements.txt /opt/idhub
-RUN pip install -r requirements.txt --break-system-packages
+RUN pip install -r requirements.txt
 
 COPY docker/idhub.entrypoint.sh /
 ENTRYPOINT sh /idhub.entrypoint.sh