chore: removes input repository from the safe workspace

[jpower432]

Description

The input repository should always exist in the GitHub workspace. Setting it again in the entrypoint is redundant.

Type of change

• Bug fix (non-breaking change which fixes an issue)

How has this been tested?

• Verified compatibility with GitHub Actions here

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (on chore: updates descriptions on actions inputs to be more precise #184)
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[beatrizmcouto]

changes made for safety, simplicity, lgtm

[jpower432]

@beatrizmcouto Re-pushed the commit. No changes, just fixed an issue with signing.