fix: add missing DESTINATION_STORAGE_CONTAINER env var in Windows VHD… (#7679)

Author: benjamin-brady

.pipelines/templates/.builder-release-template-windows.yaml

@@ -215,6 +215,7 @@ steps:
       RESOURCE_GROUP_NAME: $(AZURE_RESOURCE_GROUP_NAME)
       OS_TYPE: "Windows"
       CLASSIC_BLOB: $(STORAGE_ACCT_BLOB_URL)
+      DESTINATION_STORAGE_CONTAINER: $(STORAGE_ACCT_BLOB_URL)
       SKIP_EXTENSION_CHECK: ${{ parameters.skipExtensionCheck }}
       SIG_GALLERY_NAME: $(SIG_GALLERY_NAME)
       SIG_IMAGE_VERSION: $(SIG_IMAGE_VERSION)