Fix python call.

Author: tsalo

Dockerfile

@@ -206,7 +206,7 @@ WORKDIR /root/
 
 # Precaching templates
 COPY scripts/fetch_templates.py fetch_templates.py
-RUN ${CONDA_PYTHON} fetch_templates.py && \
+RUN python fetch_templates.py && \
     rm fetch_templates.py && \
     find $HOME/.cache/templateflow -type d -exec chmod go=u {} + && \
     find $HOME/.cache/templateflow -type f -exec chmod go=u {} +