ci: auto build docker images (#960)
build: Remove DragonOS_GCC And make CI use docker image (#954)* build: 不再需要x86_64-elf-gcc的支持 * ci: 添加ci用的docker镜像 * 切换workflow到构建用的容器上 --------- Signed-off-by: longjin <longjin@DragonOS.org>