Fixed missing variable set for private_key in git-fetch-ssh credential
Fixed missing variable set for private_key in git-fetch-ssh credential

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