[build] Support failed build job re-runs

[bashonly]

Currently, if a build job fails due to a github runner/container issue, re-running the job causes issues with the meta files (since the meta_files job is always run before the workflow aborts). For an example, see the SHA2SUMS files in the last nightly release whose ARM build jobs randomly failed on the 1st attempt.

This patch ensures that the meta files from a previous attempt are discarded and overwritten. Click here to see a successful test release

Template

Before submitting a pull request make sure you have:

• At least skimmed through contributing guidelines including yt-dlp coding conventions
• Searched the bugtracker for similar pull requests
• Checked the code with flake8 and ran relevant tests

In order to be accepted and merged into yt-dlp each piece of code must be in public domain or released under Unlicense. Check all of the following options that apply:

• I am the original author of this code and I am willing to release it under Unlicense

What is the purpose of your pull request?

• Core bug fix/improvement