Dockerfile

FROM golang:1.9-alpine as base
WORKDIR /usr/src
COPY . .
RUN apk add git
RUN CGO_ENABLED=0 go get -d -ldflags "-s -w" .
RUN CGO_ENABLED=0 go build -ldflags "-s -w" -o main

FROM scratch
COPY --from=base /usr/src/main /go-http-microservice
CMD ["/go-http-microservice"]

main.go

package main

import (
	"net/http"

	"github.com/labstack/echo"
	"github.com/labstack/echo/middleware"
)

func main() {
	e := echo.New()
	e.Use(middleware.Logger())
	e.Use(middleware.Recover())
	e.GET("/", func(c echo.Context) error {
		return c.String(http.StatusOK, "Hello, World!")
	})
	e.Logger.Fatal(e.Start(":3000"))
}

now.json

{
  "public": true,
  "features": {
    "cloud": "v2"
  },
  "alias": ["buildx.ml", "mattn"]
}