feat: keel deploy command

[jonbretman]

Keel Deploy

This adds keel deploy to the CLI for deploying a Keel app to any AWS account (self-hosting).

Integration tests

I have integrated the deploy/lambdas/runtime package into the integration tests and the keel test command, which means all that code is pretty well covered by tests. In these setups any usage of AWS API's (e.g. SSM, S3) is mocked out by providing a custom endpoint to AWS clients and setting up a very simple mock server.

The deploy code (e.g. the pulumi program) is not currently covered by tests and so needs manual QA for now. I have an idea for how to write some tests for this but they will require an AWS account to run and I think out of scope for this initial PR.

Manual testing

First you need to build the runtime Lambda binary which you can do by running this command in the repo:

$ goreleaser build --snapshot --rm-dist -p 4 --id runtime-lambda

Then you can do a deploy by running the CLI:

$ go run ./cmd/keel/main.go deploy up --env staging --runtime-binary ./dist/runtime-lambda_linux_amd64_v1/runtime-lambda -d ../path/to/some/keel/app

The Keel app must have a keelconfig.<env>.yaml file with a deploy section in it. A minimal valid config looks like this:

deploy:
  projectName: my-project
  region: eu-west-2

Other than you just need to be authenticated into the AWS account you want to deploy to. A first deploy with RDS will take around 5 minutes and updates around 2 minutes.