Add Bazel tools to docker image

Use Bazelisk to perform Bazel builds instead of relying directly
on specific Bazel version. At the moment latest LTS is chosen, but
could be later updated to a specific version if required

Signed-off-by: Anton Bondarenko <anton.bondarenko@arm.com>

Reviewed-by: Viet-Hoa Do <viet-hoa.do@arm.com>
Approved-by: Jakub Sujak <jakub.sujak@arm.com>