前言：
由于flutter官方提供的混合方案，耦合性比较重，需要每个开发人员安装flutter才能启动项目，所以采用jenkins跑任务编译出flutter产物并上传至git仓库，iOS项目用pod依赖即可。
jenkins任务配置：
FLUTTER_PROJECT_Name：flutter项目仓库名称；FLUTTER_PRODUCT_GIT_REPO：flutter项目git地址；
FLUTTER_PRODUCT_Name：flutter编译产物仓库名称；FLUTTER_PRODUCT_GIT_REPO：flutter编译产物git地址
首先分别把2个项目clone到WORKSPACE下，并拉取最新代码，再执行flutter项目下面的build_ios.sh脚本，编译flutter项目得到参物后，copy至flutter编译产物仓库中，最后上传至git。
cd ${WORKSPACE}
if [[ ! -d "${FLUTTER_PROJECT_Name}" ]]; then
git clone ${FLUTTER_PROJECT_GIT_REPO} ${FLUTTER_PROJECT_Name} -b ${PROJECT_GIT_BRANCH}
fi
if [[ ! -d "${FLUTTER_PRODUCT_Name}" ]]; then
git clone ${FLUTTER_PRODUCT_GIT_REPO} ${FLUTTER_PRODUCT_Name} -b ${PROJECT_GIT_BRANCH}
fi
cd ${WORKSPACE}/${FLUTTER_PRODUCT_Name}
git fetch
git reset --hard
git checkout ${PROJECT_GIT_BRANCH}
git pull --no-commit --all
cd ${WORKSPACE}/${FLUTTER_PROJECT_Name}
git fetch
git reset --hard
git checkout ${PROJECT_GIT_BRANCH}
git pull --no-commit --all
sh build_ios.sh -m release
