dockerbuild: Install unzip

As virtiofsd comes in the `zip` format, let's install unzip in the
containers and then be able to access the virtiofsd binary.

Signed-off-by: Fabiano Fidêncio <fabiano.fidencio@intel.com>

tools/packaging/kata-deploy/local-build/dockerbuild/Dockerfile

@@ -35,6 +35,7 @@ RUN apt-get update && \
   gcc \
   git \
   make \
+  unzip \
   xz-utils && \
   apt-get clean && rm -rf /var/lib/apt/lists