Update xenial

Author: ethomson

azure-pipelines/docker/xenial

@@ -65,6 +65,7 @@ RUN chmod a+x /usr/local/bin/entrypoint.sh
 RUN mkdir /var/run/sshd
 
 RUN useradd --shell /bin/bash libgit2
+RUN mkdir /home/libgit2
 RUN chown --recursive libgit2:libgit2 /home/libgit2
 
 USER libgit2