docs(action): fix input and output descriptions in action.yml

[kranthipoturaju]

Summary

Fixes several inaccuracies and omissions in action.yml input and output descriptions to better reflect actual runtime behavior.

Changes

• file_pattern: Description now states the pattern is applied to both git add and the git status dirty-check, and that multiple space-separated patterns are supported.
• required: false: Added to disable_globbing, create_branch, and internal_git_binary, which were the only inputs missing this field.
• changes_detected output: Rewritten to cover the CRLF-only edge case (where git diff --staged yields no diff after staging, resetting the value to "false") and to note the output is absent in create_git_tag_only mode.
• commit_hash output: Clarified that it is only set when a commit is actually created, not merely when changes are detected.
• create_git_tag_only output: Clarified it is only ever set to "true" and is absent (not "false") in normal commit flow.

Motivation

The previous descriptions were misleading in a few ways:

• file_pattern implied it only affected git add, leading users to expect untracked files to appear in the dirty-check regardless of their pattern.
• Output descriptions did not align with actual set/unset behavior, which is important for consumers using if: steps.X.outputs.Y == 'true' conditionals in their workflows.
• Inconsistent presence of required: false made the schema look unintentional to contributors reading the file.

Impact

• Users: No behavior change. These are documentation-only edits.
• Backward compatibility: Fully preserved. No input names, defaults, or output names were changed.
• Tooling: Marketplace and schema validators that read required: fields will now see consistent declarations across all inputs.

Testing

action.yml is not executable; correctness was validated by cross-referencing every changed field against entrypoint.sh:

• file_pattern usage confirmed in both _git_is_dirty() and _add_files().
• required: false is the implicit default in GitHub Actions; adding it explicitly changes no runtime behavior.
• Output set/unset paths traced through _main(), _local_commit(), and the create_git_tag_only branch.

[Copilot]

Pull request overview

Updates action.yml input/output descriptions to better match the action’s actual runtime behavior and to make the action metadata schema more consistent for users and tooling.

Changes:

• Clarifies file_pattern applies to both git add and the dirty-check, and supports multiple space-separated patterns.
• Adds explicit required: false to inputs that were missing it (disable_globbing, create_branch, internal_git_binary).
• Refines output descriptions (changes_detected, commit_hash, create_git_tag_only) to better document set/unset behavior and edge cases.

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