Auto merge of rust-lang#126113 - Kobzol:ci-native-arm-runner, r=

[WIP] CI: use a native `arm64` runner

Opening as a draft to test if we can use a native GitHub ARM runner instead of the self-hosted one.

try-job: aarch64-gnu

Author: bors

.github/workflows/ci.yml

@@ -156,12 +156,11 @@ jobs:
 
       - name: checkout submodules
         run: src/ci/scripts/checkout-submodules.sh
-      
+
       - name: Setup Python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.x'
-        if: runner.environment == 'github-hosted'
+          python-version: '3.8'
 
       - name: install MinGW
         run: src/ci/scripts/install-mingw.sh

src/ci/github-actions/jobs.yml

@@ -33,7 +33,7 @@ runners:
     <<: *base-job
 
   - &job-aarch64-linux
-    os: [ self-hosted, ARM64, linux ]
+    os: ubuntu-22.04-arm64-8core-32gb
 
 envs:
   env-x86_64-apple-tests: &env-x86_64-apple-tests
@@ -80,17 +80,19 @@ envs:
 # These jobs automatically inherit envs.pr, to avoid repeating
 # it in each job definition.
 pr:
-  - image: mingw-check
-    <<: *job-linux-4c
-  - image: mingw-check-tidy
-    continue_on_error: true
-    <<: *job-linux-4c
-  - image: x86_64-gnu-llvm-17
-    env:
-      ENABLE_GCC_CODEGEN: "1"
-    <<: *job-linux-16c
-  - image: x86_64-gnu-tools
-    <<: *job-linux-16c
+  - image: aarch64-gnu
+    <<: *job-aarch64-linux
+#  - image: mingw-check
+#    <<: *job-linux-4c
+#  - image: mingw-check-tidy
+#    continue_on_error: true
+#    <<: *job-linux-4c
+#  - image: x86_64-gnu-llvm-17
+#    env:
+#      ENABLE_GCC_CODEGEN: "1"
+#    <<: *job-linux-16c
+#  - image: x86_64-gnu-tools
+#    <<: *job-linux-16c
 
 # Jobs that run when you perform a try build (@bors try)
 # These jobs automatically inherit envs.try, to avoid repeating