[CI] github workflow to publish helm charts

[yongfengdu]

As most of the CICD is done by workflows, we'll use workflow to automatic the release work of helm-charts.
On the release branch, take v1.1 as example

1. Modify OPEA/image tag from latest to released version 1.1
2. Modify chart version from 1.0.0 to 1.1.0
3. Helm chart dependency update from 1.0.0 to 1.1.0
4. helm package
5. helm push to public repo