Make smaller exam notebook

exam-notebook/Dockerfile

@@ -1,8 +1,29 @@
-ARG IMAGE_SOURCE=ghcr.io/digiklausur/docker-stacks/notebook:latest
+ARG IMAGE_SOURCE=ghcr.io/digiklausur/docker-stacks/minimal-notebook:latest
 FROM $IMAGE_SOURCE
 
 LABEL maintainer="e2x project H-BRS <[email protected]>"
 
+USER root
+# Copy nbgrader base config
+COPY configs/nbgrader_config.py /etc/jupyter/nbgrader_config.py
+RUN chown root:$NB_GID /etc/jupyter/nbgrader_config.py &&\
+    chmod g+rwX /etc/jupyter/nbgrader_config.py
+
+USER $NB_USER
+
+# Install grading requirements
+COPY requirements.txt /tmp/requirements.txt
+RUN pip install --no-cache-dir -r /tmp/requirements.txt && \
+    pip install --no-cache-dir e2xgrader=="0.3.0-dev2"
+
+# Set up kernels
+RUN touch /etc/ipython/ipython_config.py && \
+    python -m exam_kernel.install --sys-prefix && \
+    python -m java_syntax_kernel.install --sys-prefix
+
+USER root
+RUN rm /tmp/requirements.txt
+
 USER $NB_USER
 
 # Activate student exam mode by default