[ArtifactHub.io] GPG public key annotation added

[didierofrivia]

Part of the work needed for Kuadrant/helm-charts#18

This PR adds a new annotation in the Helm Chart.yaml meant for displaying the public key used for signing its chart packages. More info in https://artifacthub.io/docs/topics/annotations/helm/

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.23%. Comparing base (92de465) to head (55aaf87).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #178      +/-   ##
==========================================
- Coverage   84.04%   82.23%   -1.82%     
==========================================
  Files          18       18              
  Lines        1210     1210              
==========================================
- Hits         1017      995      -22     
- Misses        147      162      +15     
- Partials       46       53       +7     

Flag	Coverage Δ
integration	75.78% <ø> (-2.65%)	⬇️
unit	64.23% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
api/v1alpha1 (u)	100.00% <ø> (ø)
pkg/helpers (u)	83.78% <ø> (ø)
pkg/log (u)	93.18% <ø> (ø)
pkg/reconcilers (u)	73.26% <ø> (ø)
pkg/limitador (u)	97.65% <ø> (ø)
controllers (i)	70.48% <ø> (-5.60%)	⬇️
pkg/upgrades	∅ <ø> (∅)

see 2 files with indirect coverage changes