Ads hotfix

[jigar-f]

Here's the PR for the ads fix, addressing multiple issues.

• We've now adopted the Subscription pattern for the Ads feature.
• Note: If the secret isn't found during the build, the script will fail.

However, there's one persistent problem: Google ads work in the debug build but not in the release. I suspect we might need to contact support. I'll take care of that tomorrow.

[atavism]

It looks like building a release in CI is failing:

mkdir -p ./android/app/libs && \
cp liblantern-all.aar ./android/app/libs/liblantern-all.aar
/bin/sh: 1: [[: not found
trap: ERR: bad trap
make[1]: *** [Makefile:346: lantern-installer.apk] Error 1
make[1]: Leaving directory '/home/runner/work/android-lantern/android-lantern'
make: *** [Makefile:392: package-android] Error 2
Error: Process completed with exit code 2.

[atavism]

Except for the CI issue publishing releases, this LGTM!

[jigar-f]

@atavism I am working on changes to the release flow, Will push changes shortly

[jigar-f]

@atavism Getting some kind of API issue, Do you mind taking a look at this?