Improve GH workflow updated chart identification

[eero-t]

Description

Improve release chart identification for pushing, by:

• Separating common functionality to its own function
• Making exclusion matches more explicit:
  • Exclude all files directly in helm-charts/
  • Make exclusion specific to intended filename extensions
  • Exclude non-helm subdirs, instead of files in them (including new assets/ subdir for doc screenshots)

Issues

Current *.md *.sh patterns are not file name extension matches, as * matches any string and . matches any character.

(They work just by luck, because currently none of the other files include "md" nor "sh" in their names...)

Type of change

• Bug fix (non-breaking change which fixes an issue)

Dependencies

n/a.

Tests

CI.

Notes

This ignores Helm chart docs like earlier code doc did. I do not think that to be correct though, because users can query Helm chart READMEs with helm show readme command, so chart doc not being up to date is a bit of a bug. See: https://helm.sh/docs/helm/helm_show_readme/

[eero-t]

@yongfengdu #800 depends on this.

[yongfengdu]

Yes, README.md changes should be updated too.
This also partially fixed #803

[eero-t]

Yes, README.md changes should be updated too. This also partially fixed #803

@yongfengdu I pushed update, but it does not show up here (because @poussa closed this?).

[poussa]

I merged PR#800 and that automatically closed PR#814 (this one) !

[poussa]

re-opening due to auto-close (see below)

[poussa]

hmm, re-opening does not work.

[poussa]

@eero-t I think you need to re-create the PR. Don't what is the issue and why this one was closed automatically.