First working version

Dockerfile

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+FROM mambaorg/micromamba:latest
+ARG MAMBA_DOCKERFILE_ACTIVATE=1
+
+ENV TZ=Europe/Berlin
+ENV LANG=C.UTF-8
+
+COPY --chown=$MAMBA_USER:$MAMBA_USER environment.yml /tmp/environment.yml
+RUN micromamba install -y -n base -f /tmp/environment.yml && \
+    micromamba clean -a -y
+
+USER root
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends gosu && \
+    rm -rf /var/lib/apt/lists/*
+
+# Wrapper that starts Spyder safely for desktop sessions
+COPY --chmod=0755 start-spyder.sh /usr/local/bin/start-spyder.sh
+    
+# Qt/Wayland & Matplotlib (Qt5)
+ENV QT_X11_NO_MITSHM=1
+ENV MPLBACKEND=Qt5Agg
+
+# Default workspace created dynamically in entrypoint
+WORKDIR /root
+ENTRYPOINT ["/usr/local/bin/start-spyder.sh"]
+CMD ["spyder","--new-instance"]