github: add issue posting to stress nightly

Author: RaduBerinde

.github/workflows/sanitizers.yaml renamed to .github/workflows/nightly-instrumented.yaml

@@ -0,0 +1,34 @@
+name: Nightly stress test
+
+on:
+  schedule:
+    - cron: '00 10 * * * ' # 10am UTC daily
+  workflow_dispatch:
+
+jobs:
+
+  linux-stress:
+    name: linux-stress
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v4
+        with:
+          go-version: "1.23"
+
+      - name: Run unit tests under stress
+        run: |
+          go install github.com/cockroachdb/stress@latest
+          scripts/stress.sh
+
+      - name: Post issue on failure
+        if: failure()
+        id: create-or-update-unique-issue
+        uses: ./.github/actions/post-issue
+        with:
+          title: "nightly stress tests failed"
+          body: "The nightly tress test run failed on ${{ github.sha }}. Please review the run [here](${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }})."
+          unique-title-includes: "nightly stress tests failed"
+          labels: "C-test-failure"