Azat Khuzhin 606056d6e7 ci: switch to ubuntu 20.04 ...

github action reports "internal error" for builds on ubuntu 18.04:

    linux-cmake-job (ubuntu-18.04, COMPILER_CLANG)
    This is a scheduled Ubuntu-18.04 brownout. The Ubuntu-18.04 environment is deprecated and will be removed on April 1st, 2023. For more details, see https://github.com/actions/runner-images/issues/6002

    linux-cmake-job (ubuntu-18.04, COMPILER_CLANG)
    GitHub Actions has encountered an internal error when running your job.

2023-03-07 06:15:33 +01:00

..

workflows

ci: switch to ubuntu 20.04

2023-03-07 06:15:33 +01:00