title: IdentityServer4 AddSignerCredentials RSA example
body: <p>Getting ready to move our IdentityServer4 setup from dev to test and I need to get the AddSignerCredentials() piece migrated from AddDeveloperCredentials().  I can generate a private and public RSASecurityKey but I'm unclear as to what RsaSecurityKey to pass to AddSignerCredentials().  The discovery endpoint somehow knows about the public key, but we'd want to sign tokens with the private key.  Neither seems to work</p>
  
  <p>Is there an example of how to use this somewhere in the documentation that I missed?</p>