Backport of Add container's executor to host's group for copy into release/1.9.x

[hc-github-team-secure-vault-core]

Backport

This PR is auto-generated from #17729 to be assessed for backporting due to the inclusion of the label backport/1.9.x.

WARNING automatic cherry-pick of commits failed. Commits will require human attention.

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The below text is copied from the body of the original PR.

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When copying data into the container, due to the id changes pointed out in the previous attempt, the container couldn't read this data.

By creating a new group inside the container, with the host's GID (if it doesn't already exist) and modifying the container user to also have this group, it should be able to access these files without requiring a chmod.

See also: #17658

Signed-off-by: Alexander Scheel <alex.scheel@hashicorp.com>

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