Pass --ignore-zeros to tar when decompressing zstd-compressed tarballs

[smowton]

See comment in the diff for full explanation.

Merge / deployment checklist

• Confirm this change is backwards compatible with existing workflows.
• Confirm the readme has been updated if necessary.
• Confirm the changelog has been updated if necessary.

PR Overview

This PR updates the tar extraction command for zstd-compressed tarballs by adding the "--ignore-zeros" flag to address potential issues when the archive contains trailing zero bytes.

• Updated the argument array in the extractTarZst function to include "--ignore-zeros".
• Added detailed comments explaining the need for the additional flag and linking to a relevant issue for context.

Changes

File	Description
src/tar.ts	Updated the tar extraction command to safely handle trailing zeroes by passing --ignore-zeros.

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[github-actions]

Pushed a commit to rebuild the Action. Please mark the PR as ready for review to trigger PR checks.

[henrymercer]

Thanks for the thorough investigation and explanation! This looks good to me assuming checks pass.

Do you have an opinion about whether this means we should revert #2767 and return to preferring bsdtar on macOS systems? If we revert that PR, we should add a changenote to this one.

[smowton]

No strong opinion -- using gtar is also fine. This should probably be done anyhow since it means we'll work better with BSD tar whenever it's the only one around.