Add workflow to update from AUR

.gitea/workflows/update.yml

@@ -0,0 +1,24 @@
+name: Update from AUR
+on:
+  push:
+    branches:
+      - master
+  
+jobs:
+  build:
+    runs-on: ubuntu-standard
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Add AUR repository
+        run: git remote add aur https://aur.archlinux.org/yay.git
+
+      - name: Fetch AUR
+        run: git fetch aur
+      
+      - name: Rebase current changes
+        run: git rebase aur/master
+      
+      - name: Push changes (if any)
+        run: git push origin master