Update Ubuntu 20.04 buildtools containers to Ubuntu 22.04 #5795
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Ubuntu 20.04 buildtools containers are EOL as noted in dotnet/dotnet-buildtools-prereqs-docker#1449 and need to be upgraded to a supported version.
This PR updates all references from Ubuntu 20.04 to Ubuntu 22.04:
Changes made:
azure-pipelines-arcade-PR.yml:
mcr.microsoft.com/dotnet-buildtools/prereqs:ubuntu-20.04-coredeps
→ubuntu-22.04-coredeps
ubuntu_2004_20211215
→ubuntu_2204
build.Ubuntu.2004.Amd64.Open
→build.Ubuntu.2204.Amd64.Open
eng/common/core-templates/job/source-build.yml:
build.ubuntu.2004.amd64
→build.ubuntu.2204.amd64
Ubuntu 22.04 is a supported LTS version and aligns with existing patterns already present in the codebase. All YAML configurations have been validated for syntax correctness.
Fixes #5794.
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