Add Helm chart release guide

Signed-off-by: stefanprodan <stefan.prodan@gmail.com>

docs/release_guide.md

@@ -4,19 +4,38 @@ This guide describes the process to create a GitHub Release for this project.
 
 1. [Create and push a Git tag](#create-and-push-a-git-tag)
 1. [Add release notes](#add-release-notes)
+1. [Create a Helm chart release](#create-a-helm-chart-release)
 1. [Announce the new release](#announce-the-new-release)
 
 ## Create and push a Git tag
+
 ```console
 $ export RELEASE_VERSION=<release-version> # ex: export RELEASE_VERSION=v0.1.0
 $ git tag -a "$RELEASE_VERSION" -m "<add description here>"
 $ git push origin "$RELEASE_VERSION"
 ```
 
-A [GitHub Action](/.github/workflows/release.yml) is triggered when the tag is pushed. It will build the CLI binaries, publish a new GitHub release, upload the packaged binaries and checksums as release assets, and build and push Docker images for OSM and the demo to the [`openservicemesh` organization](https://hub.docker.com/u/openservicemesh) on Docker Hub.
+A [GitHub Action](/.github/workflows/release.yml) is triggered when the tag is pushed.
+It will build the CLI binaries, publish a new GitHub release,
+upload the packaged binaries and checksums as release assets,
+and build and push Docker images for OSM and the demo to the
+[`openservicemesh` organization](https://hub.docker.com/u/openservicemesh) on Docker Hub.
 
 ## Add release notes
-In the description section of the new release, add information about feature additions, bug fixes, and any other administrative tasks completed on the repository.
+
+In the description section of the new release, add information about feature additions, bug fixes,
+and any other administrative tasks completed on the repository.
+
+## Create a Helm chart release
+
+* set the container image tag in `charts/osm/values.yaml` and `charts/osm/Chart.yaml`
+* bump the chart version in `charts/osm/Chart.yaml`
+* create a PR with the above changes and merge it to main
+* create a Git tag from main in the format `chart/x.x.x` where `x.x.x` is the chart version
+* push the Git tag to origin
+* GitHub Actions runs [helm-gh-pages](https://github.com/stefanprodan/helm-gh-pages) that packages the charts, updates `index.yaml` and pushes the changes to `gh-pages` branch
+* GitHub Pages publishes the new version, making the chart available at `https://openservicemesh.github.io/osm`
 
 ## Announce the new release
-- Make an announcement on the [mailing list](https://groups.google.com/g/openservicemesh).
+
+Make an announcement on the [mailing list](https://groups.google.com/g/openservicemesh).