chore(rootfs/Dockerfile): Add rsync

Author: Jonathan Chauncey

rootfs/Dockerfile

@@ -28,6 +28,7 @@ RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
   wget \
   zip \
   openssh-client \
+  rsync \
   --no-install-recommends \
   && rm -rf /var/lib/apt/lists/* \
   && curl -L https://storage.googleapis.com/golang/go$GO_VERSION.linux-amd64.tar.gz | tar -C /usr/local -xz \