Add necessary secret to GitHub Actions to run iOS build

[Bluebugs]

Is your feature request related to a problem? Please describe:

We currently do not make any attempt to build for iOS in our CI as we do not have the necessary secret setup for that purpose.

Is it possible to construct a solution with the existing API?

Without the secret set, it is not possible to turn on iOS CI.

Describe the solution you'd like to see:

Add the following secrets to this github repository:

• P12_CERTIFICATE_BASE64: base64 encoded value of the .p12 file (base64 -i certificates.p12)
• P12_PASSWORD: password for the .p12 certificate above
• PROVISION_PROFILE_BASE64: base64 encoded value of a .mobileprovision file (base64 -i file.mobileprovision)
• KEYCHAIN_PASSWORD: a random password that will be used for the temporary keychain during the build

[andydotxyz]

Won't it be good enough to build for iosSimulator? that uses the same APIs but does not require any certification...

[Bluebugs]

It will not tests the signature part of the process. Definitively an improvement, but if we can a full test sounds better to me.

[andydotxyz]

Let's go one then the other. To do the signing we will have to pay apple for the details listed above

[Bluebugs]

Arg, even just for tests purpose. Dang Apple. OK, well set it up for simulator then.

[andydotxyz]

I'm not sure what setup is required - there is no cryptography to configure.