[FEATURE]: Add custom DNS options for the exec driver

[danlsgiga]

Right now the exec driver does not provide a way to specify custom DNS servers for the task.

Just like the docker driver has the --dns-* options, it would be great to be able to provide custom DNS settings for exec task drivers.

I thought on setting "/opt/custom_resolv.conf" = "/etc/resolv.conf" in the chroot_env settings for the nomad clients but I'm not 100% sure it works.

[notnoop]

Thanks @danlsgiga Sorry for taking forever to get back.

This is related to #7393 and we may address these together.

[danlsgiga]

This is related to #7283 and we may address these together.

Maybe there's a typo here... 7283 is this issue! :)

[notnoop]

🤦‍♂ Oops. Sorry. I meant #7393

[danlsgiga]

Closing this in favour of #7393

[github-actions]

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