I got this reply:

Hi Dalibor,

Thanks for contacting us about this. GitHub's head offices and servers are located in the United States, but we are compliant with EU regulations like GDPR.

We do not provide invoices, but if you need specific information added to your receipts, such as company name, address or VAT/GST, you can add the information by going to your account settings page and clicking on the "Add information" button. This will bring up a free-form text box where you can enter whatever information you need. In case you need it, we have a guide that'll walk you through this:

Adding information to your receipts

Once you have added the information, you can download a past receipt with that newly-added info by following the instructions here:

Viewing your payment history and receipts

Please let us know if you have any further questions.

Best regards,
Anna

I do not know if this helps you or not. It is still a receipt and not a real invoice. You can add a company name and that's about it.

This discussion is the first result on google when searching for: github vat receipt eu

On the receipt you sent to my company:

Total: $10.00 USD*
* VAT/GST paid directly by GitHub, where applicable

Given that GitHub is registered as company with a VAT number in Denmark, (see https://datacvr.virk.dk/enhed/virksomhed/36486627)
it is unclear to me what "where applicable" means.

Is this a reverse charge?