Fix the workflow of building and running samples.

There were a few issues this patch fixes:

1. The docker build command was missing a "'".
2. The docker run command was missing a few environment variables needed to get the samples to run with a newly built image.
3. The Dockerfile was not defining the DEBIAN_FRONTEND env correctly.
4. The /build/Vulkan/data/* paths were wrong. These paths were changed in [1].
5. Also install xz-utils in docker/Dockerfile.ubuntu, which is needed by tar(1).

[1] https://github.com/SaschaWillems/Vulkan/commit/99b226237a9c7292ba60e50026598b69a85ff933

Signed-off-by: Ayush Ranjan ayushranjan@google.com