Fix deploy workflow: use ubuntu-latest with Docker CLI install

.gitea/workflows/deploy.yml

@@ -11,13 +11,17 @@ env:
 
 jobs:
   deploy:
-    runs-on: self-hosted
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout code
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
+      - name: Install Docker CLI
+        run: |
+          curl -fsSL https://get.docker.com | sh
+
       - name: Write environment file
         run: |
           cat > .env << EOF