Add source, binary, upload and test for Focal Fossa

Ubuntu 20.04 LTS
33 jobs for 2.12 in 54 minutes and 6 seconds (queued for 5 seconds)
Name Stage Failure
failed
ubuntu/disco:x86_64 Binary
E: The repository 'http://security.ubuntu.com/ubuntu disco-security Release' no longer has a Release file.
E: The repository 'http://archive.ubuntu.com/ubuntu disco Release' no longer has a Release file.
E: The repository 'http://archive.ubuntu.com/ubuntu disco-updates Release' no longer has a Release file.
E: The repository 'http://archive.ubuntu.com/ubuntu disco-backports Release' no longer has a Release file.
Running after_script
Updating build scripts...
Already up to date.
Uploading artifacts for failed job
ERROR: Job failed: exit code 1
failed
ubuntu/disco:x86 Binary
E: The repository 'http://security.ubuntu.com/ubuntu disco-security Release' no longer has a Release file.
E: The repository 'http://archive.ubuntu.com/ubuntu disco Release' no longer has a Release file.
E: The repository 'http://archive.ubuntu.com/ubuntu disco-updates Release' no longer has a Release file.
E: The repository 'http://archive.ubuntu.com/ubuntu disco-backports Release' no longer has a Release file.
Running after_script
Updating build scripts...
Already up to date.
Uploading artifacts for failed job
ERROR: Job failed: exit code 1