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It looks like I neglected to update this after introduce flavour
transformers.

Also refactor the job definition to eliminate the bug by construction.

Ensuring that the right toolchain is used.

See #18973.

The deployments are quite large and yet are currently only served for
the ghc/ghc> project.

This adds a job to test cross-compilation from x86-64 to AArch64 with
Hadrian.

Fixes #18234

The current Debian 9 image doesn't provide LLVM 7.

Namely, those marked with the ~"LLVM backend" label

This addes the necessary logic to support aarch64 on elf, as well
as aarch64 on mach-o, which Apple calls arm64.

We change architecture name to AArch64, which is the official arm
naming scheme.

Bumps bootstrap compiler to 8.10.1.

Haddock chews through enough memory to cause the CI builders to OOM and
there's frankly no reason to build documentation in this job anyways.

Previously the Hadrian jobs used the `FLAVOUR` environment variable to
communicate which flavour `ci.sh` should build whereas `make` used
`BUILD_FLAVOUR`. This caused unnecessary confusion. Consolidate these
two.

Silly mistake on my part.

Currently the Hadrian build appears not to package documentation correctly,
causing doc-tarball to fail due to the Windows build.

This should have been done when the toolchain was bumped.

Fixes #18267.

As noted in #18726, this regularly breaks. Let's test it.

Note that we don't actually perform a build of GHC itself; we merely
test that the Hadrian executable builds and works (by invoking `hadrian
--version`).

This should fix #18774.

We now have a proper periodic clean-up script installed on the runners.

We now generate our Docker images via Dhall definitions, as described in
ci-images!52. Additionally, we are far more careful about where tools
come from, using the ALEX, HAPPY, HSCOLOR, and GHC environment variables
(set in the Dockerfiles) to find bootstrapping tools.

A small typo in a rule regular expression.

These are a significant burden on our CI resources and end up failing
quite often due to #18274. Here I drop the make jobs during
validaion; it is now run only during the nightly builds.

This should have been done when we bumped the bootstrap compiler to
8.8.4.

This interfered with the autoconf variable of the same name, breaking
pre-release builds.