render.yaml

services:
- type: web
  context: ./static
  name: passthrough
  branch: master
  env: static
  buildCommand: echo "hi"
  staticPublishPath: .
  buildTriggers:
    includedPaths:
    - foo/baz/
    - foo/bar/
    ignoredPaths:
    - foo/baz/docs/ 
- type: web
  context: ./server
  name: go-server
  branch: master
  buildTriggers:
    paths:
    - ./
  env: go
  buildCommand: go build -o app .
  startCommand: ./app
  envVars:
  - key: API_HOST
    fromService:
      name: passthrough
      type: web
      envVarKey: RENDER_EXTERNAL_URL