Initialize Tilt-based local dev setup

services/hello-world/.gitignore

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+hello-world

services/hello-world/Dockerfile

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+# --- Hello World Service Dockerfile ---
+# Multi-stage build for minimal image size
+
+FROM golang:1.22-alpine AS builder
+WORKDIR /app
+COPY go.mod ./
+COPY . .
+RUN CGO_ENABLED=0 go build -o /hello-world .
+
+FROM alpine:3.19
+RUN apk --no-cache add ca-certificates
+COPY --from=builder /hello-world /hello-world
+EXPOSE 8080
+ENTRYPOINT ["/hello-world"]

services/hello-world/go.mod

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+module github.com/openstaticfish/microservices/hello-world
+
+go 1.22

services/hello-world/main.go

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+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+)
+
+func main() {
+	port := os.Getenv("PORT")
+	if port == "" {
+		port = "8080"
+	}
+
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		w.Header().Set("Content-Type", "application/json")
+		json.NewEncoder(w).Encode(map[string]string{
+			"message": "Hello from OpenStaticFish!",
+			"service": "hello-world",
+		})
+	})
+
+	http.HandleFunc("/health", func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusOK)
+		fmt.Fprint(w, "ok")
+	})
+
+	log.Printf("hello-world listening on :%s", port)
+	log.Fatal(http.ListenAndServe(":"+port, nil))
+}