Add a check for GITHUB_ACTIONS (#16912)

Author: JasonEtco

server.js

@@ -19,7 +19,7 @@ if (!module.parent) {
       // If in a deployed environment, warm the server at the start
       if (process.env.NODE_ENV === 'production') {
         // If in a true production environment, wait for the cache to be fully warmed.
-        if (process.env.HEROKU_PRODUCTION_APP) {
+        if (process.env.HEROKU_PRODUCTION_APP || process.env.GITHUB_ACTIONS) {
           await warmServer()
         } else {
           // If not in a true production environment, don't wait for the cache to be fully warmed.