feat(workflows): Add scheduled npins update

.forgejo/workflows/npins.yaml

@@ -0,0 +1,45 @@
+name: npins update
+on:
+  schedule:
+    # Run at 4 o'clock every monday
+    - cron: "0 4 * * 1"
+
+jobs:
+  npins_update:
+    runs-on: debian-latest
+    steps:
+      - name: Install applications
+        run: apt-get update && apt-get install tea sudo grep
+
+      - uses: https://github.com/cachix/install-nix-action@v22
+        with:
+          nix_path: nixpkgs=channel:nixos-unstable
+
+      - uses: actions/checkout@v3
+
+      - name: Update dependencies
+        run: |
+          npins update
+
+      - name: Open PR if necessary
+        run: |
+          git diff-index --quiet HEAD
+
+          if [ $? -eq 1 ]; then
+            echo "[+] Changes detected, pushing updates."
+
+            git add npins
+            git commit --message "chore(npins): Update"
+            git push --set-upstream chores/npins-update --force
+
+            # Connect to the server with the cli
+            tea login add \
+              -n dgnum-chores \
+              -t {{ secrets.TEA_DGNUM_CHORES_TOKEN }} \
+              -u https://git.dgnum.eu
+
+            # Create a pull request if needed
+            # i.e. no PR with the same title exists
+            tea pulls ls -f='title,author' -o simple | grep -q 'chore(npins): Update dgnum-chores') \
+            && tea pulls create -D "Automatic npins update" -t "chore(npins): Update" --head chores/npins-update
+          fi