update for py38

Dockerfile

@@ -16,7 +16,7 @@ RUN git clone -b mimic https://github.com/ceph/ceph.git /ceph
 
 ENV PATH "/miniconda/bin:$PATH"
 
-RUN curl -so installer.sh https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh && \
+RUN curl -so installer.sh https://repo.anaconda.com/miniconda/Miniconda3-latest-Linux-x86_64.sh && \
 	bash installer.sh -b -p /miniconda && \
 	rm installer.sh && \
     /miniconda/bin/conda clean -y --all && \
@@ -38,6 +38,10 @@ RUN conda create -n py36 "python >=3.6,<3.7" cython wheel && \
     rm -rf build dist && \
     scl enable devtoolset-7 "./build.sh py36"
 
-RUN conda create -n py37 "python >=3.7" cython wheel && \
+RUN conda create -n py37 "python ==3.7" cython wheel && \
     rm -rf build dist && \
     scl enable devtoolset-7 "./build.sh py37"
+
+RUN conda create -n py38 "python ==3.8" cython wheel && \
+    rm -rf build dist && \
+    scl enable devtoolset-7 "./build.sh py38"