gpgscm: Make test cleanup more robust.
* tests/gpgscm/tests.scm (mkdtemp-autoremove): New function that cleans up at interpreter shutdown. (run-tests-parallel): Use the new function. (run-tests-sequential): Likewise. (make-environment-cache): Execute setup with an temporary working directory.
Make sure to remove all resources created in the filesystem even if
the test runner is interrupted. Make sure to remove anything that the
setup script creates.
- Signed-off-by: Justus Winter <email@example.com>