ci: Change 32-bit Docker images to use EOL repos

(backport <https://github.com/rust-lang/libc/pull/4120>)
(cherry picked from commit 9830960c19c53b1527593413e0f55c8cfb067344)

Upgrade Docker images to Ubuntu 23.10

Update Docker image to Ubuntu 22.04

Signed-off-by: Yuki Okushi <[email protected]>

Update Ubuntu image to 20.04

Update Ubuntu images to 20.04

Update Ubuntu images to 19.10

Update Ubuntu images to 19.04

Move some containers to ubuntu 18.04

Apparently 17.04 is broken now?

Tweak x86 gnu images

Apparently the 17.10 image broke?

Use Ubuntu 17.10 as the base image

Test against newer c libraries

Specifically:

* Update the base docker images to ubuntu 16.10
* Update musl to version 1.1.15

This is necessary since the versions we were previously using do not
de

Test against newer c libraries

Specifically:

* Update the base docker images to ubuntu 16.10
* Update musl to version 1.1.15

This is necessary since the versions we were previously using do not
define CLONE_NEWCGROUP, so adding the symbol to the libc crate causes
test failures.

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Use docker for all CI tests and images

Previously we were somewhat half-Docker, half-Travis, half apt-get, etc. This
commit alters the CI infrastructure to use Docker images for each target. This
sh

Use docker for all CI tests and images

Previously we were somewhat half-Docker, half-Travis, half apt-get, etc. This
commit alters the CI infrastructure to use Docker images for each target. This
should make it much easier to update the images and tweak various bits and
pieces of installed software. Additionally, it's also much clearer now what's
needed for each suite of tests!

Some images were updated a bit (e.g. musl is now 1.1.14), but other images
encountered failures when updating so they're not getting updated just yet.

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