On the official project website I could only find this repository link and the link to Google Play Store for the pre-built Android binary.

However, it is available on F-Droid[0]. I wonder why Taskwarrior doesn't promote this, with the parent project being open source and F-Droid specifically for such Android projects.

[0] https://f-droid.org/repository/browse/?fdfilter=taskwarrior&...