chore: add workflow to run nightly tests on ARM64

.github/TESTS_ARE_FAILING_ON_ARM64.md

@@ -0,0 +1,10 @@
+---
+title: "Tests are failing on ARM64"
+assignees: TomAFrench, asterite
+---
+
+The Rust tests for the Noir compiler are currently failing on ARM64.
+
+Check the [Test (ARM64)]({{env.WORKFLOW_URL}}) workflow for details.
+
+This issue was raised by the workflow `{{env.WORKFLOW_NAME}}`

.github/workflows/test-rust-workspace-arm64.yml

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+name: Test (ARM64)
+
+# This workflow runs the project Rust tests on a daily basis on ARM64.
+# The main intention of doing this is making sure that build artifacts end up exactly
+# the same as in X86, but this workflow runs all tests to also make sure everything
+# works the same way on ARM64. Because of this, most of the code here is similar
+# to that in test-rust-workspace.yml
+
+on:
+  schedule:
+    # Run a check at 9 AM UTC
+    - cron: "0 9 * * *"
+
+jobs:
+  build-test-artifacts:
+    name: Build test artifacts
+    runs-on: macos-latest
+    timeout-minutes: 30
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup toolchain
+        uses: dtolnay/rust-toolchain@1.85.0
+        with:
+          targets: aarch64-apple-darwin
+
+      - uses: Swatinem/rust-cache@v2
+        with:
+          key: aarch64-apple-darwin
+          cache-on-failure: true
+          save-if: ${{ github.event_name != 'merge_group' }}
+
+      - name: Install nextest
+        uses: taiki-e/install-action@v2
+        with:
+          tool: nextest@0.9.67
+
+      - name: Build and archive tests
+        run: cargo nextest archive --workspace --features noirc_frontend/nextest --archive-file nextest-archive-arm64.tar.zst
+
+      - name: Upload archive to workflow
+        uses: actions/upload-artifact@v4
+        with:
+          name: nextest-archive-arm64
+          path: nextest-archive-arm64.tar.zst
+
+  run-tests:
+    name: "Run tests (partition ${{matrix.partition}})"
+    runs-on: macos-latest
+    needs: [build-test-artifacts]
+    timeout-minutes: 15
+    strategy:
+      fail-fast: false
+      matrix:
+        partition: [1, 2, 3, 4]
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup toolchain
+        uses: dtolnay/rust-toolchain@1.85.0
+        with:
+          targets: aarch64-apple-darwin
+
+      - name: Install nextest
+        uses: taiki-e/install-action@v2
+        with:
+          tool: nextest@0.9.67
+
+      - name: Download archive
+        uses: actions/download-artifact@v4
+        with:
+          name: nextest-archive-arm64
+      - name: Run tests
+        run: |
+          RUST_MIN_STACK=8388608 \
+          cargo nextest run --archive-file nextest-archive-arm64.tar.zst \
+            --partition count:${{ matrix.partition }}/4 \
+            --no-fail-fast
+
+  # This is a job which depends on all test jobs and reports the overall status.
+  # This allows us to add/remove test jobs without having to update the required workflows.
+  tests-end:
+    name: Rust End
+    runs-on: macos-latest
+    # We want this job to always run (even if the dependant jobs fail) as we want this job to fail rather than skipping.
+    if: ${{ always() }}
+    needs:
+      - run-tests
+
+    steps:
+      - name: Report overall success
+        run: |
+          if [[ $FAIL == true ]]; then
+              exit 1
+          else
+              exit 0
+          fi
+        env:
+          # We treat any cancelled, skipped or failing jobs as a failure for the workflow as a whole.
+          FAIL: ${{ contains(needs.*.result, 'failure') || contains(needs.*.result, 'cancelled') || contains(needs.*.result, 'skipped') }}
+
+      - name: Checkout
+        if: ${{ failure() }}
+        uses: actions/checkout@v4
+
+      # Raise an issue if the tests failed
+      - name: Alert on failed publish
+        uses: JasonEtco/create-an-issue@v2
+        if: ${{ failure() }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          WORKFLOW_NAME: ${{ github.workflow }}
+          WORKFLOW_URL: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}
+        with:
+          update_existing: true
+          filename: .github/TESTS_ARE_FAILING_ON_ARM64.md