TEMP: Use public Win Arm64 runners

Author: dpaoliello

.github/workflows/ci.yml

@@ -134,6 +134,9 @@ 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
 

src/ci/github-actions/jobs.yml

@@ -48,7 +48,7 @@ runners:
     <<: *base-job
 
   - &job-windows-aarch64
-    os: windows-11-arm64-8core-32gb
+    os: windows-11-arm
     <<: *base-job
 
   - &job-aarch64-linux

src/ci/scripts/install-clang.sh

@@ -65,6 +65,10 @@ elif isWindows && ! isKnownToBeMingwBuild; then
     # Disable downloading CI LLVM on this builder;
     # setting up clang-cl just above conflicts with the default if-unchanged option.
     ciCommandSetEnv NO_DOWNLOAD_CI_LLVM 1
+
+    # On Arm64, the Ring crate requires that Clang be on the PATH.
+    # https://github.com/briansmith/ring/blob/main/BUILDING.md
+    ciCommandAddPath "$(pwd)/clang-rust/bin"
 fi
 
 if isWindows; then

src/ci/scripts/install-rust.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+# For mingw builds use a vendored mingw.
+
+set -euo pipefail
+IFS=$'\n\t'
+
+source "$(cd "$(dirname "$0")" && pwd)/../shared.sh"
+
+if isWindows; then
+    case "${CI_JOB_NAME}" in
+        *aarch64*)
+            curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y -q --default-host aarch64-pc-windows-msvc
+            ciCommandAddPath "${USERPROFILE}/.cargo/bin"
+            ;;
+    esac
+fi