chore: import upstream snapshot with attribution

.github/workflows/slow.yml

@@ -0,0 +1,130 @@
+name: Slow Integration Tests
+
+# The workflow will always run, but the actual tests will only execute when:
+# - The workflow is triggered manually
+# - The workflow is scheduled
+# - The PR has the "run-slow-tests" label
+# - The push is to a release branch
+# - There are changes to relevant files.
+# Note: If no conditions are met, the workflow will complete successfully without running tests
+# to satisfy Branch Protection rules.
+
+env:
+  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+  HF_API_TOKEN: ${{ secrets.HUGGINGFACE_API_KEY }}
+  PYTHON_VERSION: "3.10"
+  HATCH_VERSION: "1.16.5"
+  HAYSTACK_MPS_ENABLED: false
+  HAYSTACK_XPU_ENABLED: false
+
+on:
+  workflow_dispatch: # Activate this workflow manually
+  schedule:
+    - cron: "0 0 * * *"
+  push:
+    branches:
+      # release branches have the form v1.9.x
+      - "v[0-9].*[0-9].x"
+  pull_request:
+    types:
+      - opened
+      - reopened
+      - synchronize
+      - labeled
+      - unlabeled
+
+permissions:
+  contents: read
+
+jobs:
+  check-if-changed:
+    # This job checks if the relevant files have been changed.
+    # We check for changes in the check-if-changed job instead of using paths/paths-ignore at workflow level.
+    # This ensures the "Slow Integration Tests completed" job always runs, which is required by Branch Protection rules.
+    name: Check if changed
+    runs-on: ubuntu-slim
+    permissions:
+      pull-requests: read
+    # Specifying outputs is not needed to make the job work, but only to comply with actionlint
+    outputs:
+      changes: ${{ steps.changes.outputs.changes }}
+    steps:
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
+      - name: Check for changed code
+        id: changes
+        uses: dorny/paths-filter@7b450fff21473bca461d4b92ce414b9d0420d706 # v4.0.2
+        with:
+          # List of Python files that trigger slow integration tests when modified
+          filters: |
+            changes:
+              - "haystack/components/evaluators/sas_evaluator.py"
+              - "haystack/components/generators/openai_dalle.py"
+              - "haystack/components/preprocessors/embedding_based_document_splitter.py"
+              - "haystack/components/retrievers/multi_query_embedding_retriever.py"
+
+              - "test/components/evaluators/test_sas_evaluator.py"
+              - "test/components/generators/test_openai_dalle.py"
+              - "test/components/preprocessors/test_embedding_based_document_splitter.py"
+              - "test/components/retrievers/test_multi_query_embedding_retriever.py"
+
+  slow-integration-tests:
+    name: Slow Tests / ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    needs: check-if-changed
+    timeout-minutes: 30
+    # Run tests if: manual trigger, scheduled, PR has label, release branch, or relevant files changed
+    if: |
+      github.event_name == 'workflow_dispatch' ||
+      github.event_name == 'schedule' ||
+      (github.event_name == 'pull_request' && contains(github.event.pull_request.labels.*.name, 'run-slow-tests')) ||
+      (github.event_name == 'push' && github.ref == 'refs/heads/v[0-9].*[0-9].x') ||
+      (needs.check-if-changed.outputs.changes == 'true')
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+
+    steps:
+      - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        with:
+          persist-credentials: false
+
+      - uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # v6.3.0
+        with:
+          python-version: "${{ env.PYTHON_VERSION }}"
+
+      - name: Install Hatch
+        id: hatch
+        shell: bash
+        run: |
+          python -m pip install --upgrade pip
+          pip install hatch==${{ env.HATCH_VERSION }} --uploaded-prior-to=P1D
+
+      - name: Run tests
+        run: hatch run test:integration-only-slow
+
+      - name: Notify Slack on nightly failure
+        if: failure() && github.event_name == 'schedule'
+        uses: deepset-ai/notify-slack-action@a65def0c8bf91d6520286ab34280151c76a5a008 # v1.1.0
+        with:
+          slack-webhook-url: ${{ secrets.SLACK_WEBHOOK_URL_NOTIFICATIONS }}
+
+  slow-integration-tests-completed:
+    # This job always runs and succeeds if all tests succeed or are skipped. It is required by Branch Protection rules.
+    name: Slow Integration Tests completed
+    runs-on: ubuntu-slim
+    if: ${{ always() && !cancelled() }}
+    needs: slow-integration-tests
+
+    steps:
+      - name: Mark tests as completed
+        run: |
+          if [ "${{ needs.slow-integration-tests.result }}" = "failure" ]; then
+            echo "Slow Integration Tests failed!"
+            exit 1
+          else
+            echo "Slow Integration Tests completed!"
+          fi