config: require DeployCSIDriver field

internal/config/config.go

@@ -130,7 +130,7 @@ type AWSConfig struct {
 	IAMProfileWorkerNodes string `yaml:"iamProfileWorkerNodes" validate:"required"`
 	// description: |
 	//   Deploy Persistent Disk CSI driver with on-node encryption. For details see: https://docs.edgeless.systems/constellation/architecture/encrypted-storage
-	DeployCSIDriver *bool `yaml:"deployCSIDriver"` // TODO (msanft): after v2.9 release re-enable "required" validation
+	DeployCSIDriver *bool `yaml:"deployCSIDriver" validate:"required"`
 }
 
 // AzureConfig are Azure specific configuration values used by the CLI.
@@ -472,16 +472,6 @@ func New(fileHandler file.Handler, name string, fetcher attestationconfigapi.Fet
 		c.Provider.OpenStack.Password = openstackPassword
 	}
 
-	// Backwards compatibility: configs without the field `deployCSIDriver` are valid in version 2.8.
-	// TODO (msanft): v2.9. Remove after v2.9 release.
-	if c.Provider.AWS != nil && c.Provider.AWS.DeployCSIDriver == nil {
-		fmt.Fprintln(
-			os.Stderr,
-			"WARNING: 'provider.aws.deployCSIDriver' not set. The key will be required in v2.10. Defaulting to 'false'.",
-		)
-		c.Provider.AWS.DeployCSIDriver = toPtr(false)
-	}
-
 	return c, c.Validate(force)
 }