Support deploying fastpath as a docker container

[hellais]

xref: #122

[hellais]

We discussed this with @hynnot and here is a summary:

• Next steps are finishing dockerizing this
• Adding good tests for the localhttp feeder
• Figure out what's the best approach to deploying this in AWS
  • EC2 with a local disk
  • ECS with a disk that survives throughout redeploys
• Updating terraform to deploy in some way on AWS
• Update the metrics collection to follow the patterns @LDiazN has been working on so we can collect good application level metrics for things like timing
• Configuring monolith API /report/* endpoints to point to the new API
• Depending on what we decided the AWS approach to be, maybe deploying also the backend-hel monolith on the same EC2 node to support uploader
• Run everything in test/dev environment for a bit, using probes, to make sure everything works