Only run helm/chart-release action when Chart path is changed

[dirsigler]

The GitHub Action runs currently even when I just change the project README.
Even tho there is no actual new version or release pushed to consumer, it still allocates the runner and some overhead time to actually run the release job.

Reference: https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#example-excluding-paths