Fix: Rollover Version

src/STS/Startup.cs

@@ -105,9 +105,14 @@ namespace Coscine.Api.STS
                     var pfx = Program.Configuration.GetAndWait("coscine/global/sts/pfx");
                     var passwordString = Program.Configuration.GetStringAndWait("coscine/global/sts/pfxpassword");
 
+                    var pfxFuture = Program.Configuration.GetAndWait("coscine/global/sts/pfxFuture");
+                    var passwordStringFuture = Program.Configuration.GetStringAndWait("coscine/global/sts/pfxpasswordFuture");
+
                     var x509Certificate2 = new X509Certificate2(pfx, passwordString);
+                    var x509CertificateFuture = new X509Certificate2(pfxFuture, passwordStringFuture);
 
                     options.SPOptions.ServiceCertificates.Add(x509Certificate2);
+                    options.SPOptions.ServiceCertificates.Add(new ServiceCertificate() { Certificate = x509CertificateFuture, Status = CertificateStatus.Future, Use = CertificateUse.Both });
                     options.SPOptions.WantAssertionsSigned = true;
 
                     // For dealing with `'DeclarationReference' must be an absolute Uri``