Break signinging out of generator ant build process

[ozten]

We need to isolate the signing step so that it can be performed on a different service using an HSM.

[jhugman]

This requires two steps:

• prevent the ant script from signing the APK.
• finishing off the processing of the signed APK.

Building an unsigned APK

Currently, the location of the keystore and various configuration is stored in the project.properties directory. Removing these will cause the current invocation of ant clean release to produce an unsigned APK to be produced. This is found in bin/${manifest.name}-release-unsigned.apk. Official documentation

Post signing

Use the zipalign tool to optimize the signed APK.

 zipalign -v 4 your_project_name-signed.apk your_project_name.apk

Official documentation

[ozten]

Moved to https://bugzilla.mozilla.org/show_bug.cgi?id=960225

Closing.