Cloudflare certificate

### Prerequisites

- [X] I have checked the [Wiki](https://github.com/AdguardTeam/AdGuardHome/wiki) and [Discussions](https://github.com/AdguardTeam/AdGuardHome/discussions) and found no answer

- [X] I have searched other issues and found no duplicates

- [X] I want to request a feature or enhancement and not ask a question

### The problem

I tried in a lot of ways but couldnt make adguard home to work with cloudflare ca certificate
i used origin server certificate from cf panel and origin_ca_rsa_root.pem to add it into chain and still it was invalid
i spent 3 hours searching how to merge certificates etc, but still no result

### Proposed solution

Im searching easy solution to easily add cloudflare certififcate into adguard home., so i wouldnt need to renew it after 3 months.
im renewing it manually, using docker version for now

### Alternatives considered and additional information

_No response_