chore(PE-5507): bump observer to latest image and add warp cache vol…

[dtfiedler]

…ume to docker-compose

This version of the observer uses lmdb as its contract store for improved performance. The volume allows the observer to persist cache accross restarts

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (56fe5fb) 56.89% compared to head (2679860) 56.89%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #82 +/- ## ======================================== Coverage 56.89% 56.89% ======================================== Files 18 18 Lines 5480 5480 Branches 260 260 ======================================== Hits 3118 3118 Misses 2359 2359 Partials 3 3 ```

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