Re-add call to clean

repo2docker/buildpacks/conda/__init__.py

@@ -340,7 +340,7 @@ class CondaBuildPack(BaseImage):
                     r"""
                 TIMEFORMAT='time: %3R' \
                 bash -c 'time ${{MAMBA_EXE}} install -p {0} -f "{1}" && \
-                # time ${{MAMBA_EXE}} clean --all -y && \
+                time ${{MAMBA_EXE}} clean --all -y && \
                 ${{MAMBA_EXE}} list -p {0} \
                 '
                 """.format(
@@ -359,7 +359,7 @@ class CondaBuildPack(BaseImage):
                     "${NB_USER}",
                     r"""
                 ${{MAMBA_EXE}} install -p {0} r-base{1} r-irkernel=1.2 r-devtools -y && \
-                #  ${{MAMBA_EXE}} clean --all -f -y && \
+                ${{MAMBA_EXE}} clean --all -f -y && \
                 ${{MAMBA_EXE}} list -p {0}
                 """.format(
                         env_prefix, r_pin