feat: update workflow

.github/workflows/update.yaml

@@ -0,0 +1,38 @@
+name: Update Workflow
+
+on:
+  schedule:
+    - cron: "0 0 * * *"
+
+jobs:
+  update:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Nix
+        uses: cachix/install-nix-action@v31
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+
+      - name: Use Cachix
+        uses: cachix/cachix-action@v16
+        with:
+          name: trevstack
+          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+
+      - name: Install NPM Packages
+        working-directory: ./client
+        run: npm ci
+        
+      - name: Update
+        run: nix develop --command trevstack-update
+
+      - name: Create Pull Request
+        uses: peter-evans/create-pull-request@v7
+        with:
+          delete-branch: true
+          title: Bump deps
+
+