feat(#637): Automate Uploading To Google Play

Automation - especially of very regularly repeating tasks - is key to optimize for efficiency and gain some time for the more interesting things in life - such as developing new features in your favourite todo app 😉

Hence, in this release we finally automated uploading of Android releases to the Play Store! Before, this was a manual step: After a release pipeline ran, we had to download the AAB files from the pipeline manually and upload them again in the Play Console - a boring and time consuming job. That - now - is automated; in the future, we can do the same with a push on a button.

Closes #637 (closed)