In the Installer, the configuration YAML has an apiVersion. Create an Installer command which receives the old config and converts that to the new config version. Suggested command:

gitpod-installer config migrate --config ./config.yaml # The new config will be output to STDOut

This will need to allow for incrementing multiple versions - eg, it's conceivable that someone could have a v1 config file and want to be incrementing to v3. We should support that.