Manage secrets as code

[agaudreault]

Some secrets used for different applications have been created manually in the cluster.
Using SealedSecrets seems like the best approach to manage them as code.

Another alternative would be External Secrets, but it would require a provider such as GCP Secret Manager at additional costs and secrets at this location would still need to be managed manually.

The list of the secrets that were applied manually are:

• dex/dex
• argocd/argocd-auth
• prometheus-operator/prometheus-operator-grafana
  • Only the key admin-password
• argo/argo-server-sso
• argo/argo-workflows-webhook-clients

AC

• Update the different README.md to reflect the changes
• Manage secrets as code

[agaudreault]

Starting to work on this