Update to Ubuntu 20.04 and fix downloading LLVM from CI #376
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This PR is based on #283 and #362: it updates CI to run on Ubuntu 20.04 (fixing the failure in #305), and changes how we build LLVM to hopefully fix
download-ci-llvm
. Notably, this bumps the minimum glibc version requirement to 2.31.The hard part of this PR was fixing the broken CI for Aarch64. It turns out that the failure was caused by a breaking change in
binfmt-support
package, which now requires manually enabling new binfmts after importing them (if/proc/sys/fs/binfmt_misc
is not mounted, like in CI).