REAME文件对nosa命令封装的缺陷说明

**【缺陷描述】：README中对nosa命令的封装**
README中：
```${COREOS_ASSEMBLER_CONFIG_GIT:+-v $COREOS_ASSEMBLER_CONFIG_GIT:/srv/src/config/:ro} ```
（1）如果挂载了外部的git仓库文件夹；按照当前的nesos-config的目录结构COREOS_ASSEMBLER_CONFIG_GIT为nestos-config就不合适了。
所以/srv/src/config/的挂载值应该为```${COREOS_ASSEMBLER_CONFIG_GIT}/NestOS-For-Container```；
所以```COREOS_ASSEMBLER_CONFIG_GIT=[nestos-config git路径]/NestOS-For-Container```
相关运行改为：```nosa init --force src/config```，即挂载的目录目的地址
（2）带git相关参数，包括subdir，应该是为了适配如下shell代码：
例如：```nosa init --force --branch NestOS-24.03-LTS https://gitee.com/openeuler/nestos-config.git NestOS-For-Container```

```shell
(cd src
 if ! test -e config; then
     case "${source}" in
         /*) ln -s "${source}/${subdir}" config;;
         *) git clone ${BRANCH:+--branch=${BRANCH}} --depth=1 --shallow-submodules --recurse-submodules "${source}" config
            # If a commit was specified then we'll fetch and reset
            # the specified branch to that commit. This is useful when
            # doing pipeline builds and targetting a specific commit
            # (i.e.) subordinate multi-arch build pipelines running
            # cosa init later in time than the x86_64 pipeline; new
            # commits could have come in.
            if [ -n "${COMMIT}" ]; then
                git -C ./config fetch origin "$COMMIT"
                git -C ./config reset --hard "$COMMIT"
                git -C ./config submodule update --init --recursive
            fi
            if [ -n "${subdir}" ]; then
                mv config config-git
                ln -sr config-git/"${subdir}" config
            fi
            (set +x; cd config && echo -n "Config commit: " && git describe --tags --always --abbrev=42)
            ;;
     esac
 fi)
```

openEuler/nestos-assembler

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