ci/github: run checks in a container
We need a container with a recent version of Ubuntu to run mypy in strict
mode on validate.py.
Signed-off-by: 
Vincent Stehlé <vincent.stehle@arm.com>
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We need a container with a recent version of Ubuntu to run mypy in strict
mode on validate.py.
Signed-off-by: Vincent Stehlé <vincent.stehle@arm.com>