Add DEB822 installation method for the Cloudflare package repository

Describe the feature you'd like A clear and concise description of the feature. What problem does it solve for you?

• Add DEB822 installation method for the Cloudflare package repository.
• I personally expect support for installing cloudflared via the DEB822 format on Ubuntu 26.04. Currently, the outdated /etc/apt/sources.list.d/ is still being used for https://pkg.cloudflare.com/index.html#debian-any . See https://discourse.ubuntu.com/t/spec-apt-deb822-sources-by-default/29333 .
• A notable feature of the DEB822 format compared to /etc/apt/sources.list.d/ is its friendliness towards Here Documents.

Describe alternatives you've considered Are there any alternatives to solving this problem? If so, what was your experience with them?

• I don't think so.

Additional context Add any other context or screenshots about the feature request here.

• See https://discourse.ubuntu.com/t/spec-apt-deb822-sources-by-default/29333 .