Override the default environment settings in Capistrano 3.0.1

gistfile1.txt

# Using set here doesn't work, as the git tasks are loaded later.
#   set :git_environmental_variables, ->() {
#   ...


task :override_defaults
  set :git_environmental_variables, ->() {
    {
      git_askpass: "/bin/echo",
      git_ssh:     "/home/deploy/util/gitkey/wrapper"
    }
  }
end
before 'deploy', 'override_defaults'