Initial add backend stuff

appenv/env_development.go

@@ -0,0 +1,8 @@
+//go:build !staging && !production
+
+package appenv
+
+// Environment is the deployment environment baked in at compile time.
+// Development is the default; build with `-tags staging` or `-tags production`
+// to select another environment.
+const Environment = EnvTypeDevelopment