ci: Add healthcheck for Github runners to run on a schedule

[chtruong814]

What does this PR do ?

• Add healthcheck for Github runners to run on a schedule (7 a.m. UTC)
• Checks number of gpus and reboots if gpus less than expected
• Re-runs health check if rebooted

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[terrykong]

@ko3n1g to review

[ko3n1g]

did you test this a few times, is 3min enough? Otherwise looks like a clever extension of the original workflow