ci: add Docker buildx cache for faster builds

.gitea/workflows/docker.yml

@@ -84,6 +84,9 @@ jobs:
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
+        with:
+          driver-opts: |
+            image=moby/buildkit:buildx-stable-1
 
       - name: Login to Gitea Registry
         uses: docker/login-action@v3
@@ -109,33 +112,7 @@ jobs:
           push: true
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max
 
-  deploy:
-    needs: docker
-    runs-on: ubuntu-latest
-    if: gitea.event_name == 'push' && (gitea.ref == 'refs/heads/main' || gitea.ref == 'refs/heads/master')
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v4
-
-      - name: Set up kubectl
-        uses: azure/setup-kubectl@v3
-
-      - name: Configure kubectl
-        run: |
-          mkdir -p ~/.kube
-          echo "${{ secrets.KUBE_CONFIG }}" | base64 -d > ~/.kube/config
-          chmod 600 ~/.kube/config
-
-      - name: Deploy to Kubernetes
-        run: |
-          TAG=$(echo ${{ gitea.sha }} | cut -c1-7)
-          sed -i "s|image:.*fengling-gateway.*|image: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${TAG}|g" k8s/deployment.yaml
-          kubectl apply -f k8s/deployment.yaml -n fengling
-          kubectl apply -f k8s/service.yaml -n fengling
-          kubectl rollout status deployment/fengling-gateway -n fengling --timeout=300s
-
-      - name: Verify deployment
-        run: |
-          kubectl get pods -n fengling -l app=fengling-gateway
-          kubectl get services -n fengling fengling-gateway
+  deploy: