Introduce alpha program for our macOS app

[nilsreichardt]

Adds the alpha program for macOS. Currently, the implementation does not use the sz deploy macos command because I need to adjust the command (the command also needs to do the signing). This will be done in a future PR.

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[nilsreichardt]

Status: Everything works exempts validating the build. When uploading a new version, Apple writes us an email:

Dear Developer,

We identified one or more issues with a recent delivery for your app, "Sharezone - Schulplaner" 1.6.2 (412). Please correct the following issues, then upload again.

ITMS-90238: Invalid Signature - The executable at path Sharezone.app/Contents/Frameworks/fast_rsa.framework/Versions/A/Resources/librsa_bridge.dylib has following signing error(s): code object is not signed at all In architecture: x86_64 . Refer to the Code Signing and Application Sandboxing Guide at http://developer.apple.com/library/mac/#documentation/Security/Conceptual/CodeSigningGuide/AboutCS/AboutCS.html and Technical Note 2206 at https://developer.apple.com/library/mac/technotes/tn2206/_index.html for more information.

Best regards,

The App Store Team

Not sure how to fix this because this.

[nilsreichardt]

@Jonas-Sander Could also review this PR?