$ export BUILD=linux-amd64-gccgo
$ export BUILDREV=b9151e911a54
$ docker run \
    -v $HOME/keys/$BUILD.buildkey:/.gobuildkey \
    gobuilders/linux-x86-gccgo \
    /usr/local/bin/builder -tool=gccgo -dashboard='https://build.golang.org/gccgo' -rev=$BUILDREV -buildroot=/gccgo -v -cmd='make check-go -kj' $BUILD