heroku container:login
events.js:160
throw er; // Unhandled 'error' event
^
Error: spawn docker ENOENT
at exports._errnoException (util.js:1007:11)
at Process.ChildProcess._handle.onexit (internal/child_process.js:182:32)
at onErrorNT (internal/child_process.js:348:16)
at _combinedTickCallback (internal/process/next_tick.js:74:11)
at process._tickCallback (internal/process/next_tick.js:98:9)
at Function.Module.runMain (module.js:577:11)
at startup (node.js:160:18)
at node.js:456:3