Return an empty JSON object with a 200 response

Signed-off-by: Oliver Davies <oliver@oliverdavies.uk>

go-api/.envrc

@@ -0,0 +1 @@
+use flake "git+https://code.oliverdavies.uk/opdavies/dev-shells#go"

go-api/main.go

@@ -0,0 +1,22 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+)
+
+func handler(w http.ResponseWriter, r *http.Request) {
+	fmt.Println("Running handler...")
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusOK)
+
+	json.NewEncoder(w).Encode(map[string]any{})
+}
+
+func main() {
+	http.HandleFunc("/", handler)
+
+	http.ListenAndServe(":8080", nil)
+}