Simple Go server that only prints version as response, a Dockerfile to quickly deploy it, and a k6 script that tests it

Dockerfile

FROM golang:alpine AS builder
# Install git.
# Git is required for fetching the dependencies.
RUN apk update && apk add --no-cache git
WORKDIR $GOPATH/src/vserver/
COPY . .

# Fetch dependencies.
# Using go get.
RUN go get -d -v
# Build the binary.
RUN GOOS=linux GOARCH=amd64 go build -ldflags="-w -s" -o /go/bin/vserver

FROM scratch

COPY --from=builder /go/bin/vserver /go/bin/vserver

ENV SERVER_PORT=8080
ENV SERVER_VERSION="1.0.0"
ENTRYPOINT ["/go/bin/vserver"]

k6-test.js

import http from "k6/http";

export const options = {
  vus: 1,
  duration: "10m",
  noConnectionReuse: true,
  insecureSkipTLSVerify: true,
};

export default function () {
  const response = http.get("https://api.foldapp.dev/");
  console.log(new Date().toISOString(), "Running version: ", response.body)
}

main.go

package main

import (
	"fmt"
	"log"
	"net/http"
	"os"
)

func main() {
	port, ok := os.LookupEnv("SERVER_PORT")
	if !ok {
		log.Fatal("$SERVER_PORT not set")
	}

	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		version, ok := os.LookupEnv("SERVER_VERSION")
		if !ok {
			http.Error(w, "$SERVER_VERSION not set", http.StatusInternalServerError)
			return
		}

		fmt.Fprintf(w, "%s", version)
	})

	log.Fatal(http.ListenAndServe(fmt.Sprintf(":%s", port), nil))
}