Dockerfile

# golang:latest as build-env
FROM golang:latest AS build-env

RUN mkdir /app
ADD . /app/
WORKDIR /app
RUN cd /app && GO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o myapp .
# go build -o myapp

FROM alpine
RUN mkdir /app
COPY --from=build-env /app/myapp /app

EXPOSE 8080
ENTRYPOINT ["/app/myapp"]

main.go

package main
import (
  "net/http"
  "strings"
)
func sayHello(w http.ResponseWriter, r *http.Request) {
  message := r.URL.Path
  message = strings.TrimPrefix(message, "/")
  message = "Hello " + message
  w.Write([]byte(message))
}
func main() {
  http.HandleFunc("/", sayHello)
  if err := http.ListenAndServe(":8080", nil); err != nil {
    panic(err)
  }
}