Restore lost WriteGitPropertiesFallbackFile command (#475)

Author: bart-vmware

Management/src/ActuatorWeb/README.md

@@ -158,6 +158,7 @@ When running with Podman, update these files to use `host.containers.internal`:
    * **From Source:**
 
      ```shell
+     dotnet build -t:WriteGitPropertiesFallbackFile
      cf push
      ```