ci: enable experimental ocaml workflow on aarch64

.github/workflows/main.yml

@@ -21,14 +21,25 @@ concurrency: # On new push, cancel old workflows from the same PR, branch or tag
 jobs:
   ocaml-tests:
     name: Run OCaml tests
-    runs-on: ubuntu-22.04
+    strategy:
+      fail-fast: false
+      matrix:
+        runs-on: ["ubuntu-22.04"]
+        experimental: [false]
+        include:
+        - runs-on: "ubuntu-22.04-arm"
+          experimental: true
+
+    continue-on-error: ${{ matrix.experimental }}
+    runs-on: ${{ matrix.runs-on }}
     permissions:
       contents: read
     env:
       # Ensure you also update test-sdk-builds
       # when changing this value, to keep builds
       # consistent
       XAPI_VERSION: "v0.0.0"
+
     steps:
       - name: Checkout code
         uses: actions/checkout@v4