Add workflow to build DS without torch to better test before releases (#6450)

- Adds a nightly workflow that tests to confirm we can build DeepSpeed
without torch as a dependency, as this often only surfaces when doing a
release.

.github/workflows/no-torch.yml

@@ -0,0 +1,45 @@
+name: no-torch
+
+on:
+  workflow_dispatch:
+  pull_request:
+    paths:
+      - '.github/workflows/no-torch.yml'
+  schedule:
+    - cron: "0 0 * * *"
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+    contents: read
+    issues: write
+
+jobs:
+  unit-tests:
+    runs-on: ubuntu-22.04
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - id: setup-venv
+        uses: ./.github/workflows/setup-venv
+
+      - name: Python environment
+        run: |
+          pip uninstall torch --yes
+          pip list
+
+      - name: Build deepspeed
+        run: |
+          DS_BUILD_STRING=" " python setup.py sdist
+
+      - name: Open GitHub issue if nightly CI fails
+        if: ${{ failure() && (github.event_name == 'schedule') }}
+        uses: JasonEtco/create-an-issue@v2
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          filename: .github/ISSUE_TEMPLATE/ci_failure_report.md
+          update_existing: true