[Feature] Signing with custom Entitlement file

[FFNUser]

Request

Hi! I really liked QoL changes you added to Feather 🤗

So inside Feather Source Code, I believe there is already technical support for entitlement files, but it is hidden behind building argument. It would be nice, if you would have included it in the pre-builds of RyukSign.

Request Agreement

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Contributor Checks

• I am willing to attempt to make a pull request with these requested features