There is no set regulation in Australia for candle containers, however, it is important that the supplier provide any safety data information or instructions on the containers if available.
It is then up to you as the Candlemaker to perform quality control processes and batch testing to ensure the container is fit for purpose and keeping records of such testing. Visual inspections also need to be done prior to filling and after filling to ensure the product is safe from hazards.
Here is a link with more information on Product Safety and the Australian Consumer Law which provides information on the requirements for safe products for consumers. https://www.accc.gov.au/business/treating-customers-fairly/product-safety