feat: gitea workflows

.gitea/workflows/update.yaml

@@ -0,0 +1,39 @@
+name: Update
+
+on:
+  schedule:
+    - cron: "0 0 * * *"
+  workflow_dispatch:
+
+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 }}"
+
+      # https://github.com/actions/checkout/issues/13
+      - name: Set Git Config
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
+
+      - name: Update
+        run: nix run .#update
+
+      - name: Create Pull Request
+        uses: peter-evans/create-pull-request@v7
+        with:
+          title: update
+          body: automatic update