fix: reinstall docker cli in deploy container

.gitea/workflows/ci.yml

@@ -53,6 +53,11 @@ jobs:
         with:
           name: next-build
 
+      - name: Install Docker CLI
+        run: |
+          apt-get update
+          apt-get install -y docker.io
+
       - name: Deploy to Docker
         run: |
           docker build -t nextjs-app .