Dependency signature verification for bdk-swift

[reez]

Describe the enhancement
Digitally sign xcframework for bdk-swift.

Use case
Developers using bdk-swift will be able to verify xcframework is digitally signed.

Additional context
In Xcode 15 Apple will show whether the framework has been digitally signed or not.

Currently the bdk-swift xcframework would look like this in Xcode 15, "unsigned":

Apple references:

• WWDC23 session video
• Apple Developer Documentation article

[thunderbiscuit]

Cool! Let me know if you need the GPG keys for the signature (is it done in the CI? that's what it is for the Kotlin libraries).

[reez]

Cool! Let me know if you need the GPG keys for the signature (is it done in the CI? that's what it is for the Kotlin libraries).

Sweet! Yeah it looks just like a one line command we can do in the CI. I’ll go see what you all do in Kotlin since you do it there, just because I’m interested in how that works-

[reez]

I think the only hangup here is the need to have an Apple Distribution certificate to sign with (which I'm not sure if we have or not)

[reez]

We have an Apple Developer account now so we should have all the pieces in place to do this when it's risen to the top of the priority list-

[thunderbiscuit]

Sounds good let's do it!