feat: go greenlight api wip

projects/greenlight/cmd/api/healthcheck.go

@@ -0,0 +1,19 @@
+package main
+
+import (
+	"net/http"
+)
+
+func (app *application) healthcheckHandler(w http.ResponseWriter, r *http.Request) {
+	env := envelope{
+		"status":      "available",
+		"environment": app.config.env,
+		"version":     version,
+	}
+
+	err := app.writeJSON(w, http.StatusOK, env, nil)
+	if err != nil {
+		// Use the new serverErrorResponse() helper.
+		app.serverErrorResponse(w, r, err)
+	}
+}