restoring ssh key as file
restoring ssh key as file

reverts fix for https://github.com/ros-infrastructure/buildfarm_deployment/issues/75

clearpathrobotics/buildfarm_deployment,clearpathrobotics/buildfarm_deployment,clearpathrobotics/buildfarm_deployment,ros-infrastructure/buildfarm_deployment,ros-infrastructure/buildfarm_deployment,ros-infrastructure/buildfarm_deployment,ros-infrastructure/buildfarm_deployment