Commits on Oct 16, 2023

1. Run solid_queue with SQLite …

   Update the tests to run solid_queue on SQLite.
   
   They can be triggered by:
   ```
   TARGET_DB=sqlite rails test
   ```
   
   The adapter is prone to raising `SQLite3::BusyException`s when
   concurrent transactions occur. Preventing this requires a couple of
   patches to the adapter.
   
   1. Implement retry with backoff - add a `retries` config setting
   to the adapter and sleep progressively longer for each retry. This
   setting is currently in the Rails main branch, but that implementation
   has no backoff. That doesn't work well in our case.
   1. Always create immediate transactions - SQLite by default creates
   deferred transactions, which don't take a write lock. Then later if
   there is a write it tries to upgrade the lock. This won't work if the
   transaction has a stale read so retrying the write by itself is not
   possible. Starting with an immediate transaction moves the write lock to
   that point and ensures that we only get blocked on a retryable
   transaction.

   

   djmb committed Oct 16, 2023
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