[FR] add OS/Apps key signing setup

[steadfasterX]

Description

describe your feature request as detailed as possible:

Include/move: https://github.com/sfX-android/android_buildtools/tree/main/sign

Target version

What's your current custom OS and Android version you're building for:

...

_What Android version should support that feature (add an x within the [ ] brackets, select all that should

• Android 9
• Android 10
• Android 11
• Android 12
• Android 13
• Android 14

What custom OS should support that feature (add an x within the [ ] brackets, select / add all that should apply):

• Lineage OS
• AXP.OS
• AOSP

Note

when sharing logs it is strongly recommended
using github gists