health action: let someone point at a different ref/repo

[kevmoo]

Allows more experimenting

[github-actions]

PR Health

Changelog Entry ✔️

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Coverage ✔️

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Unused Dependencies ✔️

Package	Status
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Breaking changes ✔️

Package	Change	Current Version	New Version	Needed Version	Looking good?

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API leaks ✔️

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Package	Leaked API symbol	Leaking sources

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License Headers ✔️

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Files
no missing headers

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[gemini-code-assist]

Code Review

This pull request introduces a new GitHub Action for installing ecosystem packages using a composite action and a supporting Bash script. The feedback suggests enhancing the script's robustness by adding error handling with set -eo pipefail, validating the presence of WORKFLOW_REF, and supporting short repository names. Additionally, it is recommended to quote the script path in the action definition to prevent issues with spaces in directory names.