set aws region just in case

main.py

@@ -9,9 +9,10 @@ app = FastAPI()
 aws_access_key_id = os.environ['AWS_ACCESS_KEY_ID']
 aws_secret_access_key = os.environ['AWS_SECRET_ACCESS_KEY']
 s3_bucket_name = os.environ['S3_BUCKET_NAME']
+aws_region = 'eu-central-1'
 
 # Initialize an S3 client
-s3_client = boto3.client('s3', aws_access_key_id=aws_access_key_id, aws_secret_access_key=aws_secret_access_key)
+s3_client = boto3.client('s3', aws_access_key_id=aws_access_key_id, aws_secret_access_key=aws_secret_access_key, region_name=aws_region)
 
 @app.post("/merge_audio/{output_key}")
 async def merge_audio(output_key: str):