Periodic CI for longer tests

[povilasv]

We need a period CI which runs with THANOS_ENABLE_STORE_READ_TIMEOUT_TESTS

and probably some other tests that take a long run.

[povilasv]

/assign @bwplotka :D

[bwplotka]

Hm, is this still needed @povilasv? 🤔

[povilasv]

AFAIK yes. We still don't run those tests, so we don't know if it's broken..

[stale]

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