feat: Cluster ephemeral volume configuration validation.

Signed-off-by: Josh Fyne <josh.fyne@gmail.com>

api/v1/cluster_webhook.go

@@ -309,6 +309,7 @@ func (r *Cluster) Validate() (allErrs field.ErrorList) {
 		r.validateMaxSyncReplicas,
 		r.validateStorageSize,
 		r.validateWalStorageSize,
+		r.validateEphemeralVolumeSource,
 		r.validateTablespaceStorageSize,
 		r.validateName,
 		r.validateTablespaceNames,
@@ -1475,6 +1476,19 @@ func (r *Cluster) validateWalStorageSize() field.ErrorList {
 	return result
 }
 
+func (r *Cluster) validateEphemeralVolumeSource() field.ErrorList {
+	var result field.ErrorList
+
+	if r.Spec.EphemeralVolumeSource != nil && (r.Spec.EphemeralVolumesSizeLimit != nil && r.Spec.EphemeralVolumesSizeLimit.TemporaryData != nil) {
+		result = append(result, field.Duplicate(
+			field.NewPath("spec", "ephemeralVolumeSource"),
+			"ephemeralVolumeSource and ephemeralVolumesSizeLimit.temporaryData are in conflict, set one only",
+		))
+	}
+
+	return result
+}
+
 func (r *Cluster) validateTablespaceStorageSize() field.ErrorList {
 	if r.Spec.Tablespaces == nil {
 		return nil