Certificates are a request for an X.509 Certificate to be issued from cert-manager
This Certificate will tell cert-manager to attempt to use the Issuer named
letsencrypt-prod to obtain a certificate key pair for the
bar.example.com domains. If successful, the resulting key and certificate will be stored in a secret named
acme-crt-secret with keys of
tls.crt respectively. This secret will live in the same namespace as the Certificate resource.