build: ensure test is running on git commit that this code works with

build: ensure test is running on git commit that this code works with

Since https://gitlab.com/fdroid/ci-test-app is a separate git repo, things
with incompatible changes could get out of sync.  Therefore, this test
should specify which git commit is runs against.

For example, the .fdroid.yml file is still a moving target.  Just now, the
keys had the spaces removed as part of this MR.