Schedule rust update in build_and_test.yml (#1687)

* ci cron

* correct regex

.github/workflows/update_rust_toolchain.yml

@@ -0,0 +1,29 @@
+name: Update Rust toolchain
+
+on:
+  schedule:
+    - cron: '0 0 * * *'  # Debug
+
+jobs:
+  update-timestamp:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          ref: update_from_ci
+      - uses: actions/setup-python@v3
+        with:
+          python-version: '3.10' 
+
+      - name: Setup Git
+        run: |
+          git config --local user.email "actions@github.com"
+          git config --local user.name "GitHub Actions"
+
+      - name: Commit & push data
+        run: |
+          sed -i 's/rustup toolchain install nightly[0-9a-ZA-Z-]*/\`date +"rustup toolchain install nightly-%Y-%m-%d"\`/' ./.github/workflows/build_and_test.yml
+          git add -u
+          git commit -m "Update rust toolchain & time [$(date +'%Y-%m-%d %H:%M')]"
+          git push