bootloader: fix docker build script to work with hdl-ci-dockerfiles

bootloader/build/docker_build.sh

 #!/bin/bash
 
-docker create --name build_cont arm-clang-coast:latest /bin/bash -c "cd diot-monimod/bootloader/build; make clean; make -j9"
-docker cp ../../../diot-monimod build_cont:/root/
-docker start -a build_cont
-docker cp build_cont:/root/diot-monimod/bootloader/build/. .
-docker rm build_cont
+docker run --rm -it -v $(pwd)/../../:/root/diot-monimod armv6m-gcc-clang-coast bash -c 'cd /root/diot-monimod/bootloader/build && pwd && echo '"$@"' && make clean && make '"$@"