添加dadk支持 (#263)

* 引入dadk，使用dadk0.1.1来编译test-relibc程序

* 由于gitee仓库体积限制导致无法继续使用gitee上的rust索引，因此更换为清华源

* github workflow的环境中，安装dadk

* Auto configure dragonos rust toolchain

user/dadk/config/relibc-0.1.0.dadk

@@ -0,0 +1,30 @@
+{
+  "name": "relibc",
+  "version": "0.1.0",
+  "description": "从GitHub克隆最新的relibc来编译",
+  "task_type": {
+    "BuildFromSource": {
+      "Git": {
+        "url": "https://github.com/DragonOS-Community/relibc.git",
+        "branch": "dragonos-relibc",
+        "revision": null
+      }
+    }
+  },
+  "depends": [],
+  "build": {
+    "build_command": "bash init_dragonos_toolchain.sh && DESTDIR=$DADK_BUILD_CACHE_DIR_RELIBC_0_1_0 make install -j $(nproc)"
+  },
+  "install": {
+    "in_dragonos_path": "/usr"
+  },
+  "clean": {
+    "clean_command": "make clean"
+  },
+  "envs": [    
+    {
+      "key": "TARGET",
+      "value": "x86_64-unknown-dragonos"
+    }
+  ]
+}