Install Operator Lifecycle Manager (OLM) onto the cluster using Homebrew:

https://sdk.operatorframework.io/docs/installation/#install-from-github-release

operator-sdk olm install

Create Doppler secret in /bootstrap/init:

kubectl create secret generic \
 doppler-service-token \
  --from-literal dopplerToken=$(doppler configs tokens create --project avelin --config prd doppler-auth-token --plain) \
  --dry-run=client \
  -o yaml > doppler-secret.yaml