Fix conda install failure for tslearn by falling back to pip (#384)

* Fix conda install failure for tslearn by falling back to pip
* clean/no-cache-dir to reduce Docker image size from 8.11 GB to 5.94GB

Author: tbarsballe

planet-notebook-docker/Dockerfile

@@ -16,10 +16,14 @@ USER $NB_UID
 # without channel set to strict, a conflicting version of gdal
 # is sometimes installed from the default channel
 RUN conda config --set channel_priority strict && \
-    conda install -y -c conda-forge --file /tmp/requirements.txt
+    conda install -y -c conda-forge --file /tmp/requirements.txt && \
+    conda clean --all -f -y
+
+# This fails to install under conda
+RUN pip install --no-cache-dir tslearn
 
 # Attempts to avoid having to hardcode this failed.
 # ref: https://github.com/planetlabs/notebooks/issues/101
 ENV PROJ_LIB=/opt/conda/share/proj
 
-WORKDIR /home/jovyan/work
+WORKDIR /home/jovyan/work

planet-notebook-docker/requirements.txt

@@ -24,4 +24,3 @@ scikit-learn
 sentinelhub
 shapely
 tqdm
-tslearn