Automate default policies update process

[jopemachine]

• This PR automates the default policy update process using some python scripts and Github Action (Update seccomp profiles #10).

[jopemachine]

I wrote this utility function to simplify codes,
but I think utility like dot-prop looks also good.

get_property({'foo': {'bar': 'unicorn'}}, 'foo.bar');
//=> 'unicorn'

get_property({'foo': {'bar': 'a'}}, 'foo.notDefined.deep');
//=> None

[achimnol]

We actually already have one implementation 😉: https://github.com/lablup/backend.ai/blob/e2e18a2/src/ai/backend/common/utils.py#L107

[achimnol]

If there is a well-packaged 3rd-party library with a clean API, I think it is also good to use one.

[jopemachine]

I copied and pasted the nmget code, but maybe making it as a separate lib named nmget might be better idea to maintain.

[achimnol]

We actually already have one implementation 😉: https://github.com/lablup/backend.ai/blob/e2e18a2/src/ai/backend/common/utils.py#L107

[achimnol]

If there is a well-packaged 3rd-party library with a clean API, I think it is also good to use one.

[CLAassistant]

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✅ jopemachine
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