Feature Request: Warn on user ${{ input }} in steps[*].run

[drts01]

I would like to be warned if a step is using user input inside the "run" part of a step to mitigate the risk of script injections.

Inputs includes:

• inputs.*
• env.* (why not just use the environment variable)
• github.actor
• github.event.[issue | pull_request].[body | default_branch | email | head_ref | label | message | name | page_name | ref | title]
• github.event.inputs.*
• github.head_ref (could be branch name)
• github.ref (can be branch and tag names)
• github.ref_name

(I may be missing some that should be on the list.)

[drts01]

Here is a better list of what to filter for under github.event, https://securitylab.github.com/research/github-actions-untrusted-input/

[azu]

Previously, I've requested same thing https://github.com/rhysd/actionlint/issues/19 and it is implemented.

• https://github.com/rhysd/actionlint/releases/tag/v1.6.0

If you know missing parts, please list up these. It may help author to implement it.