Nothing to do. No chart changes detected

Hi,

I'm having a bit of trouble getting this workflow to work.

You can find my workflow [here](https://github.com/prologic/netdata-helmchart/blob/master/.github/workflows/release.yml)

Basically when I run this and make some chart changes I end up with:

```
Run helm/chart-releaser-action@v1.0.0
netdata-helmchart
Looking up latest tag...
Discovering changed charts since '1fe4c3b8e1f1385caf11c17e422c832c711078d3'...
Nothing to do. No chart changes detected.
```

See [sample run](https://github.com/prologic/netdata-helmchart/runs/1030121451)

I'm not really sure what I'm doing wrong. The only way I was able ot get this to work was to put things in a directory layout like `charts//...` but we don't really want to change our helm chart repo structure.

Thanks!

Start with the linked .github/workflows/release.yml and sample run, then inspect how helm/chart-releaser-action discovers changed charts and compare that with the repository's chart layout. Reproduce the workflow with a chart change; done means the action detects and releases changes without requiring an unwanted charts/ restructure.

Written by the indexing model from the issue text.