feat: Add caching headers for env.js in Nginx configuration

knockoutwhistweb/conf/staging.conf

@@ -0,0 +1,12 @@
+include "application.conf"
+
+play.http.context="/api"
+
+play.modules.enabled += "modules.GatewayModule"
+
+play.filters.cors {
+  allowedOrigins = ["https://st.knockout.janis-eccarius.de"]
+  allowedCredentials = true
+  allowedHttpMethods = ["GET", "POST", "PUT", "DELETE", "OPTIONS"]
+  allowedHttpHeaders = ["Accept", "Content-Type", "Origin", "X-Requested-With"]
+}