ci: 添加 Gitea Actions 示例工作流

- 新增 ci.yaml 文件，定义 Gitea Actions 示例

.gitea/workflows/ci.yaml

@@ -56,7 +56,6 @@ jobs:
             GO_VERSION="1.22.0"
             GO_ARCH="linux-amd64"
             MIRRORS=(
-              "https://golang.google.cn/dl/go${GO_VERSION}.${GO_ARCH}.tar.gz"
               "https://mirrors.aliyun.com/golang/go${GO_VERSION}.${GO_ARCH}.tar.gz"
               "https://mirrors.huaweicloud.com/golang/go${GO_VERSION}.${GO_ARCH}.tar.gz"
               "https://mirrors.tencent.com/go/go${GO_VERSION}.${GO_ARCH}.tar.gz"