Add K8s manifests and CD pipeline for K3s deployment

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitea/workflows/build.yaml

@@ -1,4 +1,4 @@
-name: Build and Push Container Image
+name: CI/CD Pipeline
 
 on:
   push:
@@ -52,3 +52,30 @@ jobs:
         run: |
           VERSION=${GITEA_REF#refs/tags/}
           docker push ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${VERSION}
+
+  deploy:
+    runs-on: ubuntu-latest
+    needs: build
+    if: gitea.event_name != 'pull_request'
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup kubeconfig
+        run: |
+          mkdir -p ~/.kube
+          echo "${{ secrets.KUBE_CONFIG }}" | base64 -d > ~/.kube/config
+          chmod 600 ~/.kube/config
+
+      - name: Apply manifests
+        run: |
+          kubectl apply -f k8s/configmap.yaml -f k8s/service.yaml -f k8s/deployment.yaml
+
+      - name: Update image
+        run: |
+          kubectl set image deployment/cfb-manager \
+            cfb-manager=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ gitea.sha }}
+
+      - name: Wait for rollout
+        run: |
+          kubectl rollout status deployment/cfb-manager --timeout=120s