Set default S3_USE_AWS to false in compose file

Updated the docker-compose.yaml to default the S3_USE_AWS environment variable to 'false' if not set, ensuring consistent behavior when the variable is unset.

docker/docker-compose.yaml

@@ -683,7 +683,7 @@ services:
       PLUGIN_MEDIA_CACHE_PATH: ${PLUGIN_MEDIA_CACHE_PATH:-assets}
       PLUGIN_STORAGE_OSS_BUCKET: ${PLUGIN_STORAGE_OSS_BUCKET:-}
       S3_USE_AWS_MANAGED_IAM: ${PLUGIN_S3_USE_AWS_MANAGED_IAM:-false}
-      S3_USE_AWS: ${PLUGIN_S3_USE_AWS:-}
+      S3_USE_AWS: ${PLUGIN_S3_USE_AWS:-false}
       S3_ENDPOINT: ${PLUGIN_S3_ENDPOINT:-}
       S3_USE_PATH_STYLE: ${PLUGIN_S3_USE_PATH_STYLE:-false}
       AWS_ACCESS_KEY: ${PLUGIN_AWS_ACCESS_KEY:-}