Enhance diff check logic in develop-update

[The0mikkel]

No description provided.

[Copilot]

Pull Request Overview

This PR enhances the diff detection logic in the develop-update workflow by switching from content-based comparison to commit-based comparison, making it more robust for tracking changes that need to be merged from main to develop.

Key Changes:

• Replaced git diff with git rev-list --count to check for commits in main that aren't in develop
• Updated documentation to accurately reflect the new commit-based detection logic
• Removed trailing whitespace for code cleanliness

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
.github/workflows/develop-update.yml	Enhanced diff check logic to use git rev-list --count instead of git diff, added explanatory comments, and removed trailing whitespace
README.md	Updated documentation to describe the new commit-based detection approach instead of general "merge detection"

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