Fix conda ToS: explicitly remove all default channels and use --override-channels

Dockerfile

@@ -12,20 +12,23 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     bash \
     && rm -rf /var/lib/apt/lists/*
 
-# Install Miniconda for FEniCS
-RUN wget https://repo.anaconda.com/miniconda/Miniconda3-latest-Linux-x86_64.sh -O /tmp/miniconda.sh \
-    && bash /tmp/miniconda.sh -b -p /opt/conda \
-    && rm /tmp/miniconda.sh
+# Install Miniforge (conda-forge only, no ToS issues)
+RUN wget https://github.com/conda-forge/miniforge/releases/latest/download/Miniforge3-Linux-x86_64.sh -O /tmp/miniforge.sh \
+    && bash /tmp/miniforge.sh -b -p /opt/conda \
+    && rm /tmp/miniforge.sh
 
 ENV PATH="/opt/conda/bin:${PATH}"
 
-# Configure conda to use only conda-forge (no ToS acceptance needed)
-RUN conda config --remove channels defaults || true && \
+# Remove ALL default channels and use ONLY conda-forge to avoid ToS issues
+RUN conda config --remove channels defaults 2>/dev/null || true && \
+    conda config --remove channels https://repo.anaconda.com/pkgs/main 2>/dev/null || true && \
+    conda config --remove channels https://repo.anaconda.com/pkgs/r 2>/dev/null || true && \
     conda config --add channels conda-forge && \
-    conda config --set channel_priority strict
+    conda config --set channel_priority strict && \
+    conda config --show channels
 
-# Install FEniCS via conda-forge only
-RUN conda install fenics-dolfinx mpich petsc4py -y && conda clean -afy
+# Install FEniCS via conda-forge ONLY
+RUN conda install -c conda-forge --override-channels fenics-dolfinx mpich petsc4py -y && conda clean -afy
 
 # Install Python dependencies (use conda's pip)
 COPY requirements.txt .