add aarch64

unittest.Dockerfile

 FROM python:3.8
 
-RUN pip install satella>=2.14.24 snakehouse>=1.3 nose2 wheel coverage
+RUN pip install satella>=2.17.13 snakehouse>=1.3 nose2 wheel coverage
 
 ADD tempsdb /app/tempsdb
 ADD setup.py /app/setup.py