Optimize CI test process: Docker

[robert-zaremba]

Summary

Problem Definition

e2e tests require app in Docker image. It takes ~5min to build that image.

Proposal

We already build binaries (price-feeder and umeed) in few other jobs. Instead, let's try to reuse it, and change the process of creating a docker by just copying the binaries and libwasmvm into docker ,without downloading all build dependencies etc...

NOTE: this should not impact nor change the flow of release and the umeed.dockerfile. It should only change the flow of the e2e tests.