Azure Managed Identity support

Cache.php

@@ -186,6 +186,10 @@ public static function engine_name( $engine, $module = '' ) {
 				$engine_name = 'Microsoft Azure Storage';
 				break;
 
+			case 'azuremi':
+				$engine_name = 'Microsoft Azure Storage (Managed Identity)';
+				break;
+
 			case 'edgecast':
 				$engine_name = 'Media Template ProCDN / EdgeCast';
 				break;

CdnEngine.php

@@ -36,6 +36,10 @@ public static function instance( $engine, array $config = array() ) {
 					$instances[ $instance_key ] = new CdnEngine_Azure( $config );
 					break;
 
+				case 'azuremi':
+					$instances[ $instance_key ] = new CdnEngine_Azure_MI( $config );
+					break;
+
 				case 'bunnycdn':
 					$instances[ $instance_key ] = new CdnEngine_Mirror_BunnyCdn( $config );
 					break;