Test reproducibility of GDK binary from github used by Green and Green build completely from source (as done in FDroid)

Update:

1. Green build process in WS download GDK binary "gdk-android-jni.tar.gz" from: https://github.com/Blockstream/gdk/releases/ it should be tested for RB separately to the green build process.
2. Green build process in fdroid use different script prepare_gdk_clang.sh to build from source (that build gdk from source instead of downloading precompiled binary from github) https://github.com/Blockstream/green_android/blob/master/BUILD.md#cross-compile-the-native-libraries-advanced https://gitlab.com/fdroid/fdroiddata/-/blob/15dcf8b55a9c85b8dbeb23cc811c5ea825fa941c/metadata/com.greenaddress.greenbits_android_wallet.yml#L1729 and should be tested for RB

Old content of issue (not apply anymore to recent versions)

Steps to Reproduce on F-droid:

1. download apk https://f-droid.org/repo/com.greenaddress.greenbits_android_wallet_349.apk
2. run:

git clone https://github.com/Blockstream/green_android/
cd green_android
git checkout release_3.4.9

Add file Containerfile with content:

FROM frolvlad/alpine-glibc

RUN set -ex; \
    apk update; \
    apk add --no-cache \
        bash \
        curl \
        perl-utils \
        openjdk8; \
    adduser -D appuser;

USER appuser

COPY --chown=appuser:root . /app/green/

ENV ANDROID_SDK_ROOT="/app/sdk"

RUN set -ex; \
# Create required license accept file
    ANDROID_SDK_LICENSES="${ANDROID_SDK_ROOT}/licenses"; \
    mkdir -p "${ANDROID_SDK_LICENSES}"; \
    printf "\n24333f8a63b6825ea9c5514f83c2829b004d1fee" > "${ANDROID_SDK_LICENSES}/android-sdk-license";

WORKDIR /app/green/
RUN ./gradlew assembleProductionRelease

run:

podman build --rm -t green_build_apk .
podman run --rm --name green_built_apk -ti green_build_apk

from other tab run while the above container running, after file is copied, run exit.

podman cp green_built_apk:/app/green/app/build/outputs/apk/production/release/app-production-release-unsigned.apk ~/host-green-apk-rebuild-349.apk

Diff changes are:

1. versionCode in AndroidManifest in manifest tag: android:versionCode="22000349" vs android:versionCode="349"
2. additional /btctestnet/checkpoints file in assets directory.