Android のキーストア名
To set the keystore name, you can specify an absolute path, or a relative path to your Unity project's location. If you provide
a relative path or an absolute path to the file inside of the project, Unity stores it as a relative path to the project. If you provide
an absolute path to the dedicated keystore location Unity stores it as a relative path to the dedicated location. All other absolute paths are stored as is.
When reading the value, this returns exactly what Unity stores internally. If the keystore is stored in the Unity project, or a dedicated keystore location,
a relative path is returned. This means that there is no way to identify if the path is relative to the Unity project, or dedicated keystore location. This
returns an absolute path, if an absolute path is stored in Unity.