tests: Ignore config for valkey related tests The Python module valkey isn't packaged yet in Debian, also the needed server part is provided within a Docker container which requires further work to be usable while the package build or while running the CI.
tests: Skip test_server_root_path_handling on riscv64 This test is flaky on riscv64 and expected to fail. Mostly as the ASGI side isn't communicating, so the problem seems to be outside litestar (on the CI infratructure).
