feat: Add external Supabase URL support for generating file signed URL (

#3179)

# Description

Please include a summary of the changes and the related issue. Please
also include relevant motivation and context.

## Checklist before requesting a review

Please delete options that are not relevant.

- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my code
- [ ] I have commented hard-to-understand areas
- [ ] I have ideally added tests that prove my fix is effective or that
my feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged

## Screenshots (if appropriate):

.env.example

@@ -28,6 +28,7 @@ NEXT_PUBLIC_SHOW_TOKENS=false
 
 LOG_LEVEL=INFO
 SUPABASE_URL=http://host.docker.internal:54321
+EXTERNAL_SUPABASE_URL=http://localhost:54321
 SUPABASE_SERVICE_KEY=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJzdXBhYmFzZS1kZW1vIiwicm9sZSI6InNlcnZpY2Vfcm9sZSIsImV4cCI6MTk4MzgxMjk5Nn0.EGIM96RAZx35lJzdJsyH-qQwv8Hdp7fsn3W0YpN81IU
 PG_DATABASE_URL=postgresql://postgres:postgres@host.docker.internal:54322/postgres
 PG_DATABASE_ASYNC_URL=postgresql+asyncpg://postgres:postgres@host.docker.internal:54322/postgres

backend/api/quivr_api/modules/upload/service/generate_file_signed_url.py

@@ -2,11 +2,13 @@
 
 from quivr_api.modules.dependencies import get_supabase_client
 from supabase.client import Client
+import os
 
 logger = get_logger()
 
 SIGNED_URL_EXPIRATION_PERIOD_IN_SECONDS = 3600
-
+EXTERNAL_SUPABASE_URL = os.getenv("EXTERNAL_SUPABASE_URL", None)
+SUPABASE_URL = os.getenv("SUPABASE_URL", None)
 
 def generate_file_signed_url(path):
     supabase_client: Client = get_supabase_client()
@@ -21,6 +23,9 @@ def generate_file_signed_url(path):
             },
         )
         logger.info("RESPONSE SIGNED URL", response)
+        # Replace in the response the supabase url by the external supabase url in the object signedURL
+        if EXTERNAL_SUPABASE_URL and SUPABASE_URL:
+            response["signedURL"] = response["signedURL"].replace(SUPABASE_URL, EXTERNAL_SUPABASE_URL)
         return response
     except Exception as e:
         logger.error(e)