🩹(summary) fix configuration in staging

@rouja forgot to add the right environment variable for the celery
workers. Fixed it.

src/helm/env.d/staging/values.meet.yaml.gotmpl

@@ -267,6 +267,9 @@ celery:
       secretKeyRef:
         name: summary
         key: OPENAI_API_KEY
+    OPENAI_BASE_URL: https://albertine.beta.numerique.gouv.fr/v1
+    OPENAI_ASR_MODEL: openai/whisper-large-v3
+    OPENAI_LLM_MODEL: meta-llama/Llama-3.1-8B-Instruct
     WEBHOOK_API_TOKEN:
       secretKeyRef:
         name: summary