[helm] makefile target for ghcr.io hosting

[poussa]

Description

Push Helm charts to opea-project ghcr.io registry ghcr.io/opea-project/charts/<chart-name>

Issues

#342

Type of change

List the type of change like below. Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds new functionality)
• Breaking change (fix or feature that would break existing design and interface)

Dependencies

None

Tests

Tested manually. Pushes charts properly.

[lianhao]

Dolpher had the experience of publish helm charts to repo, so added him as the reviewer. And we're planning to move all the helm charts from here to GenAIExamples and GenAIComps repos respectively in v1.2 release cycle.

[mkbhanda]

Who has access to publish? @hshen14 ? @yongfengdu . Please provide @poussa

[yongfengdu]

Current released charts are here, https://github.com/opea-project/GenAIInfra/tree/charts-release, and was generated by this script:
https://github.com/opea-project/GenAIInfra/blob/charts-release/update_chart_repo.sh
To avoid version confusion, I suggest we just push the current one from charts-release to ghcr.io instead of "helm package" again.
for file in *1.0.0.tgz; do helm push $file oci://$(RELEASE_REGISTRY)/charts; done
We can enhance the current script and setup CIs for automatic release after the helm-chart directory move done.

[yongfengdu]

"-maxdepth 2" only cover the top level examples, we should also release the helm charts for components, which are in the helm-charts/common directory.
https://github.com/opea-project/GenAIInfra/tree/charts-release

[yongfengdu]

@poussa Just talked with @lianhao and found more gaps with the version management.
Currenlty for a release, we'll modify versions in this job:
https://github.com/opea-project/GenAIInfra/blob/main/.github/workflows/manual-freeze-tag.yaml

1. Docker image version - change from latest to release version(v1.1)
   2). Helm chart version upgrade from 1.0.0 to 1.1.0, this include
   a. all components' version upgraded to 1.1.0
   b. Chart.yaml dependency changed to 1.1.0

To use the Makefile version, all helm-chart version are modified on the fly, this leaves the docker images version unchanged, and the dependency in Chart.yaml is not changed accordingly.

Before the above issues discussed and resolved, I think we still need to do the release via gihub actions instead of just simple "make helm-push"

[yongfengdu]

As we decide to use GH workflow to handle the release, this PR will be closed after #570 merged.