Rollup merge of #140136 - dpaoliello:arm64winci, r=Kobzol

Add an aarch64-msvc build running on ARM64 Windows

Resurrecting rust-lang/rust#126341

Per <https://github.com/rust-lang/rfcs/pull/3817> we intend to promote `aarch64-pc-windows-msvc` to Tier 1. As part of that work, we are adding a pre-merge CI job to validate that changes do not break this target.

Additionally, for consistency, the `dist-aarch64-msvc` job will also be run on Arm64 Windows runners.

r? ``@Kobzol``

try-job: `*aarch64-msvc*`

.github/workflows/ci.yml

@@ -152,6 +152,9 @@ jobs:
       - name: show the current environment
         run: src/ci/scripts/dump-environment.sh
 
+      - name: install rust
+        run: src/ci/scripts/install-rust.sh
+
       - name: install awscli
         run: src/ci/scripts/install-awscli.sh