Create CI for cevmos

[mattdf]

Given the complexity of properly setting up a cevmos deployment for testing while developing or reviewing PRs, we need a CI pipeline that performs continous integration against the changes and tests the whole stack end to end to prevent regressions or wasting time fighting with local setups.

Steps required for CI:

• Check out evmos branch and compile target ethermint+optimint branch
• Spin up mock network and run tests
• Deploy a network with cevmos that uses a real DALC (celestia-node)
• Test network upgrades against existing state for non-consensus breaking PRs

Besides an external CI, it would also be useful to have docker-compose scripts that can easily be run locally for at least some of these steps while developing.

(Edited by @jbowen93 )

A non conclusive list of sub tasks for this:

• Create a latest tagged cevmos docker image #18
• Create GH Action to create debug Cevmos docker image #19
• Create Integration Test GH Action for Ephemeral Cluster #20

[jbowen93]

This is almost done

PR jbowen93#8 does this for the evmos repo (though currently only on the jbowen93 fork)
PR celestiaorg/ethermint#33 does this for the ethermint repo
Issue rollkit/rollkit#339 tracks work to do this for the optimint repo which should be almost the same as the ethermint work.