refact(ci): bashisms.yml

[jeevithakannan2]

Type of Change

• New feature
• Bug fix
• Documentation update
• Refactoring
• Hotfix
• Security patch
• UI/UX improvement

Description

• Fixed bashisms not working when manually ran.
• Trigger bashisms workflow only when sh files are changed in PRs ( Previously changes to any file inside tabs dir triggered the workflow ).
• Use tj-actions/changed-files action to get the changed files in PRs.

Testing

• https://github.com/jeevithakannan2/linutil_ci/pull/8
• https://github.com/jeevithakannan2/linutil_ci/actions/runs/11262488127

Checklist

• My code adheres to the coding and style guidelines of the 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.
• My changes generate no errors/warnings/merge conflicts.