优化 Docker 镜像构建工作流：新增小写图像名称设置，确保一致性

.github/workflows/build-and-deploy.yml

@@ -26,11 +26,14 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
+      - name: Set lowercase image name
+        run: echo "IMAGE_NAME=$(echo ${{ github.repository }} | tr '[:upper:]' '[:lower:]')" >> $GITHUB_ENV
+
       - name: Build and push
         uses: docker/build-push-action@v6
         with:
           context: .
           push: true
-          tags: ghcr.io/${{ github.repository }}:latest
+          tags: ghcr.io/${{ env.IMAGE_NAME }}:latest
           cache-from: type=gha
           cache-to: type=gha,mode=max