There must be at least one APK available for this test suite to work, for
example, this test:
grep -F '<application id=' repo/index.xml
This can't be easily implemented using an env vir beccause the while
loop is running in a pipe, so a different process.
copy_apks_into_repo is used with throwaway tmp dirs, so the stamp file
should work well.
48e11ea3f1
