Add Ubuntu 20.04 CI jobs for nightly and release
Adds Ubuntu 20.04 jobs using the image added in ci-images!48 (merged). I tested this by running the CI once with the regular job enabled before disabling it again and squashing the commits.
Adds Ubuntu 20.04 jobs using the image added in ci-images!48 (merged). I tested this by running the CI once with the regular job enabled before disabling it again and squashing the commits.