[release/1.6] release: rollback Ubuntu to 18.04 (except for riscv64) #7260
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Backport of #7258
See https://github.com/samuelkarp/containerd/actions/runs/2806523405 for a successful run
Partially revert 0e56e4f
Rollback the build environment from Ubuntu 22.04 to 18.04, except for riscv64 that isn't supported by Ubuntu 18.04.
Fix issue 7255 (
1.6.7 can't be run on Ubuntu LTS 20.04 (GLIBC_2.34 not found)
)Signed-off-by: Akihiro Suda akihiro.suda.cz@hco.ntt.co.jp
(cherry picked from commit 4818610)
Signed-off-by: Samuel Karp samuelkarp@google.com