Add Dockerfile for AzCopy

Docker/dockerfile

@@ -0,0 +1,16 @@
+FROM microsoft/dotnet:2.1-runtime
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+         rsync \
+         libunwind8 \
+    && rm -rf /var/lib/apt/lists/*
+
+RUN set -ex \
+    && curl -L -o azcopy.tar.gz \
+    https://aka.ms/downloadazcopylinux64 \
+    && tar -xf azcopy.tar.gz && rm -f azcopy.tar.gz \
+    && ./install.sh && rm -f install.sh \
+    && rm -rf azcopy
+
+CMD ["azcopy", "--version"]