Add app icon banner for development builds

[jkmassel]

When testing features on-device, there's currently no indication that you're running a development build – it looks just like the App Store app icon. This can lead to some confusion – a developer or tester might think they're testing the App Store version, when in fact they're testing a branch. Or they may be testing a branch, but not know which one.

Suggested fix: Add the branch name and commit hash to the icon for develop builds. This can be mostly the same code as is currently used to create the banner for internal builds.

For bonus points: Currently generating the banner uses ImageMagick, which requires the installation of an additional dependency. It'd be great to use a Swift script + CoreText to do this instead – an example of something like this can be found in https://github.com/wordpress-mobile/release-toolkit/tree/add/screenshot-tool-updates-for-woo/ext/drawText.

[ghost]

Hi @jkmassel when mentioning the develop builds I am assuming the Debug target?

[jkmassel]

@sofiavistas – that's mostly right – the debug configuration for any app target in the project would be ideal! :)

[stale]

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