add example dockerfile

Author: mattes

cli/examples/Dockerfile

@@ -0,0 +1,12 @@
+FROM ubuntu:xenial
+
+RUN apt-get update && \
+    apt-get install -y curl apt-transport-https
+
+RUN curl -L https://packagecloud.io/mattes/migrate/gpgkey | apt-key add - && \
+    echo "deb https://packagecloud.io/mattes/migrate/ubuntu/ xenial main" > /etc/apt/sources.list.d/migrate.list && \
+    apt-get update && \
+    apt-get install -y migrate
+
+RUN migrate -version
+