distro/rhel85: disable pw auth for EC2 images

Disable loging in via password authentication since this is an
official Amazon marketplace requirement

  Linux-based AMIs must not allow SSH password authentication.
  Disable password authentication via your sshd_config file by
  setting PasswordAuthentication to NO.

  Section "Security policies" from
  https://docs.aws.amazon.com/marketplace/latest/userguide/product-and-ami-policies.html

internal/distro/rhel85/pipelines.go

@@ -371,6 +371,12 @@ func ec2BaseTreePipeline(repos []rpmmd.RepoConfig, packages []rpmmd.PackageSpec,
 		p.AddStage(osbuild.NewRHSMStage(rhsmStageOptions))
 	}
 
+	p.AddStage((osbuild.NewSshdConfigStage(&osbuild.SshdConfigStageOptions{
+		Config: osbuild.SshdConfigConfig{
+			PasswordAuthentication: common.BoolToPtr(false),
+		},
+	})))
+
 	return p, nil
 }