This should optimize LRU cache eviction so main and branches always have
reasonably fresh gradle caches and main does not ever get evicted, since
branches have independent caches and would otherwise fill up 10GB cache limit

Note that `--daemon` is specified as the default for this action is no daemon,
that is correct for long-lived runners to avoid cross-build contamination, but
on GitHub Hosted Runners (which we use) we are clean each run, so this is a small
optimization to share gradle between steps: gradle/gradle-build-action#113 (comment)

This is the recommended way to upgrade hamcrest from 1.x to 2.x when
using junit 4.x, see http://hamcrest.org/JavaHamcrest/distributables#gradle-upgrade-example

extract our best-practices build settings to project-level file, apply
to all sub-projects

Fixes ankidroid#11083

Sometimes an emulator "runs" tests, but it actually discovered zero
tests, runs zero tests, and still reports success. Lookin' at you API21.

Fixes ankidroid#11078

It appears upstream has fixed the leak as of 0.45.0, so workaround
not needed, and ktlint is now on 0.45.2 anyway, so use that

Can't remove the actual version override that gets us 0.45.x until
the ktlint gradle plugin has a new release but that hasn't happened yet