add goofys custom

Creates the configuration variable to toggle custom endpoint and the default custom endpoint.

roles/matrix-synapse/defaults/main.yml

@@ -218,7 +218,9 @@ matrix_synapse_ext_password_provider_ldap_filter: ""
 
 
 matrix_s3_media_store_enabled: false
+matrix_s3_media_store_custom_endpoint_enabled: false
 matrix_s3_goofys_docker_image: "ewoutp/goofys:latest"
+matrix_s3_media_store_custom_endpoint: "your-custom-endpoint"
 matrix_s3_media_store_bucket_name: "your-bucket-name"
 matrix_s3_media_store_aws_access_key: "your-aws-access-key"
 matrix_s3_media_store_aws_secret_key: "your-aws-secret-key"