Sets the temporary signing credential.
public static IIdentityServerBuilder AddDeveloperSigningCredential(IIdentityServerBuilder builder, bool persistKey = True, string filename, RsaSigningAlgorithm signingAlgorithm = 0)
                - Returns:
 - IIdentityServerBuilder
 
Parameters
builder
                                IIdentityServerBuilder
The builder.
persistKey
                                bool
Specifies if the temporary key should be persisted to disk.
filename
                                string
The filename.
signingAlgorithm
                                RsaSigningAlgorithm
The signing algorithm (defaults to RS256)