feat(examples): Add nginx-golang from awesome-compose repository

nginx-golang/.dockerignore

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+/.unikraft/

nginx-golang/README.md

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+# Compose: Nginx and Golang
+
+This is a [Compose](https://unikraft.cloud/docs/guides/features/compose/)-based example of a [Go]() HTTP server and an [Nginx](https://nginx.org/en/) proxy.
+It is imported from the [`awesome-compose` repository](https://github.com/docker/awesome-compose).
+
+To run Nginx and Golang with Compose on Unikraft Cloud, first [install the `kraft` CLI tool](https://unikraft.org/docs/cli).
+Then clone this examples repository and `cd` into this directory, and invoke:
+
+```console
+kraft cloud compose up
+```
+
+The command will deploy files in the current directory.
+
+After deploying, you can query the service using the provided URL for Nginx.
+Golang is only running in the backend with a public URL.
+Find out the Nginx provided URL by using:
+
+```console
+kraft cloud instance list
+```
+
+## Learn more
+
+- [The Compose Specification](https://github.com/compose-spec/compose-spec/blob/main/spec.md)
+- [Unikraft Cloud's Documentation](https://unikraft.cloud/docs/)
+- [Building `Dockerfile` Images with `Buildkit`](https://unikraft.org/guides/building-dockerfile-images-with-buildkit)

nginx-golang/backend/Dockerfile

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+# syntax=docker/dockerfile:1.4
+FROM --platform=$BUILDPLATFORM golang:1.23-bookworm AS builder
+
+WORKDIR /app
+
+#ENV CGO_ENABLED 0
+ENV GOPATH /go
+ENV GOCACHE /go-build
+
+COPY go.mod go.sum ./
+RUN --mount=type=cache,target=/go/pkg/mod/cache \
+    go mod download
+
+COPY . .
+
+RUN --mount=type=cache,target=/go/pkg/mod/cache \
+    --mount=type=cache,target=/go-build \
+    go build \
+      -buildmode=pie \
+      -ldflags "-linkmode external -extldflags -static-pie" \
+      -tags netgo \
+      -o bin/backend main.go
+
+FROM scratch
+COPY --from=builder /app/bin/backend /usr/local/bin/backend

nginx-golang/backend/Kraftfile

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+spec: v0.6
+
+runtime: base:latest
+
+labels:
+  cloud.unikraft.v1.instances/scale_to_zero.policy: "off"
+  cloud.unikraft.v1.instances/scale_to_zero.stateful: "false"
+  cloud.unikraft.v1.instances/scale_to_zero.cooldown_time_ms: 1000
+
+rootfs: ./Dockerfile
+
+cmd: ["/usr/local/bin/backend"]

nginx-golang/backend/go.mod

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+module github.com/docker/awesome-compose/nginx-golang/backend
+
+go 1.18
+
+require github.com/go-chi/chi/v5 v5.0.7

nginx-golang/backend/go.sum

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+github.com/go-chi/chi/v5 v5.0.7 h1:rDTPXLDHGATaeHvVlLcR4Qe0zftYethFucbjVQ1PxU8=
+github.com/go-chi/chi/v5 v5.0.7/go.mod h1:DslCQbL2OYiznFReuXYUmQ2hGd1aDpCnlMNITLSKoi8=

nginx-golang/backend/main.go

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+package main
+
+import (
+	"fmt"
+	"log"
+	"net/http"
+
+	"github.com/go-chi/chi/v5"
+	"github.com/go-chi/chi/v5/middleware"
+)
+
+func handler(w http.ResponseWriter, r *http.Request) {
+	fmt.Fprintf(
+		w, `
+o.   .o       _ _               __ _
+Oo   Oo  ___ (_) | __ __  __ _ ' _) :_
+oO   oO ' _ '| | |/ /  _)' _' | |_|  _)
+oOo oOO| | | | |   (| | | (_) |  _) :_
+ OoOoO ._, ._:_:_,\_._,  .__,_:_, \___)
+
+
+Hello from Unikraft!
+
+`,
+	)
+}
+
+func main() {
+	r := chi.NewRouter()
+	r.Use(middleware.Logger)
+	r.Get("/", handler)
+
+	fmt.Println("Go backend started!")
+	log.Fatal(http.ListenAndServe(":80", r))
+}

nginx-golang/compose.yaml

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+services:
+  proxy:
+    build: ./proxy
+    ports:
+      - 443:80
+    depends_on:
+      - backend
+
+  backend:
+    build: ./backend

nginx-golang/proxy/Kraftfile

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+spec: v0.6
+
+runtime: nginx:latest
+
+labels:
+  cloud.unikraft.v1.instances/scale_to_zero.policy: "on"
+  cloud.unikraft.v1.instances/scale_to_zero.stateful: "false"
+  cloud.unikraft.v1.instances/scale_to_zero.cooldown_time_ms: 1000
+
+rootfs: ./rootfs
+
+cmd: ["/usr/bin/nginx", "-c", "/etc/nginx/nginx.conf"]

nginx-golang/proxy/rootfs/etc/nginx/nginx.conf

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+worker_processes  1;
+daemon            off;
+master_process    off;
+user root root;
+
+events {
+  worker_connections  64;
+}
+
+http {
+  server {
+    listen 80;
+    location / {
+      proxy_pass http://nginx-golang-backend.internal:80;
+    }
+  }
+}