add support for GPU (cuda)

docker-compose.ferret.yml

@@ -90,7 +90,8 @@ services:
     environment:
       PUBLIC_INTERNAL_API_HOST: "http://nginx:80"
       PUBLIC_TRANSLATION_API_HOST: ""
-      PUBLIC_API_HOST: ${WHISHPER_PUBLIC_URL:-}
+      PUBLIC_API_HOST: ${WHISHPER_HOST:-}
+      PUBLIC_WHISHPER_GPU: ${WHISHPER_GPU:-false}
     depends_on:
       transcription-api:
         condition: service_healthy