Upgrading a service

1. Release a new version of the service by pushing an image with the new version tag to Docker Hub (or whatever Docker repository is used).
2. Update the chart in the charts repository to install the current version. For charts using the recommended pattern of determining the default Docker tag via the appVersion chart metadata, this only requires updating appVersion in Chart.yaml. Some charts cannot (or do not) do this, in which case the version has to be changed elsewhere, normally in values.yaml. Also update the version of the chart in Chart.yaml (which follows semantic versioning). When this PR is merged, a new chart will automatically be published.
3. Update the chart version in the Phalanx Chart.yaml file for the appropriate service under /services. If the chart is not pinned (if, in other words, it uses a version range constraint instead of a specific version), no Phalanx change is required.

This will tell Argo CD that the change is pending, but no changes are applied automatically. To apply the changes in a given environment, see Syncing Argo CD.