Fixing broken NPM typings package build

.github/workflows/push-to-npm.yml

@@ -49,7 +49,7 @@ jobs:
       - name: "Build"
         run: yarn run build
         env:
-          API_URL: "localhost:8080"
+          PUSHER_URL: "//localhost:8080"
         working-directory: "front"
 
       # We build the front to generate the typings of iframe_api, then we copy those typings in a separate package.