CI: ubuntu-toolchain-r/test repository will be removed

[pheiduck]

The ubuntu-toolchain-r/test PPA will be removed from Ubuntu images. The images rollout process will start on May 6 and take 3-4 days.

Mitigation ways

The repository can still be added manually in runtime by calling to following commands:

sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y
sudo apt-get update -y

ref: actions/runner-images#9679

[chrisbra]

thanks and what is this repository used for?

[pheiduck]

It's for the gcc compiler 13.

[chrisbra]

thanks. Can you add this as comment as to why we need to add this repo?

[chrisbra]

thanks!