[CLOSED] Implementing releases for the harmony Helm Chart

[jfavellar90]

This PR aims to implement the chart-releaser action to handle the releases of the harmony chart, hosting it in GitHub Pages. This PR implies the following changes in this repo:

• The harmony chart was moved to a folder called charts, which complies with the chart-releaser standard.
• The gh-pages branch was pushed to the repo. This branch will host the README of the repo and an index.yaml file containing harmony chart helpful metadata to install the chart with helm. This index.yaml file is auto-generated by the chart-releaser action, so it will exist once the first release is run.
• Repo configuration was changed to build GitHub pages from the gh-pages branch, as indicated in the chart-releaser prerequisites. The page is already available at https://openedx.github.io/openedx-k8s-harmony/
• A GitHub Action was added to run the chart release routine. This action will be run only if changes in the charts are detected.

If this is merged, operators would be able to add the helm repo and install the chart like this:

helm repo add openedx-harmony https://openedx.github.io/openedx-k8s-harmony
helm repo update
helm install [RELEASE_NAME] openedx-harmony/harmony-chart

[openedx-webhooks]

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[itsjeyd]

Hey @jfavellar90, a friendly reminder to follow up on @bradenmacdonald's comment above.

[jfavellar90]

Closed on behalf of https://github.com/openedx/openedx-k8s-harmony/pull/40

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