signflinger
Signflinger is what Gradle Android Plugin uses to sign APKs. It should be easy to package, especially compared to other parts of the Android SDK, based on our experience with ZipFlinger.
- https://android.googlesource.com/platform/tools/base/+/1b7392cc73a2c4e7d08dc20cd71faab9e4a33308/signflinger/README.md
- https://salsa.debian.org/android-tools-team/zipflinger
- apksig is already packaged as part of apksigner