.github: Add ARM64 CI (#376)

* .github: Add ARM64 CI

* Add more ARM64 build

* Remove arm64 from 3.14-dev build

Author: corona10

.github/workflows/main.yml

@@ -20,14 +20,18 @@ jobs:
       fail-fast: false
       matrix:
         # Test all supported versions on Ubuntu:
-        os: [ubuntu-latest]
+        os: [ubuntu-latest, ubuntu-24.04-arm]
         python: ["3.9", "3.10", "3.11", "3.12", "3.13"]
         experimental: [false]
         build: ['']
         include:
           # As the experimental task for the dev version.
           - os: ubuntu-latest
-            python: "3.13-dev"
+            python: "3.13"
+            experimental: true
+            build: 'free-threading'
+          - os: ubuntu-24.04-arm
+            python: "3.13"
             experimental: true
             build: 'free-threading'
           - os: ubuntu-latest