It reached EOL and the CI job fails with the following output:
sudo apt-get update > /dev/null
E: The repository 'http://security.ubuntu.com/ubuntu cosmic-security Release' does not have a Release file.
E: The repository 'http://archive.ubuntu.com/ubuntu cosmic Release' does not have a Release file.
E: The repository 'http://archive.ubuntu.com/ubuntu cosmic-updates Release' does not have a Release file.
E: The repository 'http://archive.ubuntu.com/ubuntu cosmic-backports Release' does not have a Release file.
It reached EOL and the CI job fails with the following output: