added docker builder

src/zeo/Dockerfile

@@ -0,0 +1,12 @@
+FROM python:3.9-slim
+RUN apt-get update && apt-get install -y \
+    gcc  \
+    && rm -rf /var/lib/apt/lists/*
+RUN pip install ZODB==5.6.0
+RUN pip install ZEO==5.2.1
+ADD ./zeo.conf /etc/zeo.conf
+ADD ./run.sh /run.sh
+RUN chmod +x /run.sh
+VOLUME ["/var/zeo/fs", "/var/zeo/blobs"]
+EXPOSE 8100
+CMD /run.sh