Chart testing tool failed to detect charts changed, which causes the chart got update without chart version bump

[brynsofz]

Description

The current Helm CI workflow configuration sets:

ct lint --chart-dirs . --target-branch main --validate-maintainers=false

from helm-ci.yaml.

However, this does not work as expected — the chart-testing tool reports Directory "geoserver/latest" is not a valid chart directory. Skipping... and skips chart validation.

Analysis

It seems that chart-testing's ct lint command does not correctly handle nested chart directory structures. In practice, chart-testing expects chart directories to be direct subdirectories of the specified --chart-dirs path, but our charts are located in geoserver/latest/ and mapstore/latest/ directories.

Goal

Need to find a way to fix this, can auto detect the chart folder, or pre-defined chart directories for the CI testing

[brynsofz]

@randomorder

I created this PR to fix this issue and tested it. With this fix, from now on, if anyone want to update the charts, they must bump the chart versions. By doing that, we can have the better versioning of the chart and the ability to rollback the chart or customize deployments.

[brynsofz]

The PR is merged. And the tool is checking version bump in PR correctly