Fastboot fails to execute

gistfile1.txt

//Docker CMD ran at launch is CMD [ "ember", "fastboot", "--serve-assets", "--environment=production", "--port=8080" ]
//First time this runs, it fails.  If the container is restarted (so as to already have ran through building once), it starts as expected.

7/22/2016 11:50:14 AM[?25hCould not start watchman; falling back to NodeWatcher for file system events.
7/22/2016 11:50:14 AM[?25hVisit http://ember-cli.com/user-guide/#watchman for more info.
7/22/2016 11:51:18 AM[?25l⠋ Building⠙ Building⠹ Building⠸ Building⠼ Building⠴ Building⠦ Building⠧ Building⠇ Building⠏ Building⠋ Building⠙ Building⠹ Building⠸ Building⠼ Building⠴ Building⠦ Building⠧ Building⠇ Building⠏ Building⠋ Building⠙ Building⠹ Building⠸ Building⠼ Building⠴ Building⠦ Building⠧ Building⠇ Building⠏ Building⠋ Building⠙ Building⠹ Building⠸ Building⠼ Building⠴ Building⠦ Building⠧ Building⠇ Building⠏ Building⠋ Building⠙ Building⠹ Building⠸ Building⠼ Building⠴ Building⠦ Building⠧ Building⠇ Building⠏ Building⠋ Building⠙ Building⠹ Building⠸ Building⠼ Building⠴ Building⠦ Building⠧ Building⠇ Building⠏ Building⠋ Building⠙ Building⠹ Building⠸ Building⠼ Building⠴ Building⠦ Building⠧ Building⠇ Building⠏ Building⠋ Building⠙ Building⠹ Building⠸ Building⠼ Building⠴ Building⠦ Building⠧ Building⠇ Building⠏ Building⠋ Building⠙ Building⠹ Building⠸ Building⠼ Building⠴ Building⠦ Building⠧ Building⠇ Building⠏ Building⠋ Building⠙ Building⠹ Building⠸ Building⠼ Building⠴ Building⠦ Building⠧ Building⠇ Building⠏ Building⠋ Building⠙ Building⠹ Building⠸ Building⠼ Building⠴ Building⠦ Building⠧ Building⠇ Building⠏ Building⠋ Building⠙ Building⠹ Building⠸ Building⠼ Building⠴ Building⠦ Building⠧ Building⠇ Building⠏ Building⠋ Building⠙ Building⠹ Building⠸ Building⠼ Building⠴ Building⠦ Building⠧ Building⠇ Building⠏ Building⠋ Building⠙ Building⠹ Building⠸ Building⠼ Building⠴ Building⠦ Building⠧ Building⠇ Building⠏ Building⠋ Building⠙ Building⠹ Building⠸ Building⠼ Building⠴ Building⠦ Building⠧ Building⠇ Building⠏ Building⠋ Building⠙ Building⠹ Building⠸ Building⠼ Building⠴ Building⠦ Building[?25hInstalling FastBoot npm dependencies
7/22/2016 11:51:18 AM[?25h
7/22/2016 11:51:18 AM[?25hBuild successful - 61876ms.
7/22/2016 11:51:18 AM
7/22/2016 11:51:18 AMSlowest Trees                                 | Total               
7/22/2016 11:51:18 AM----------------------------------------------+---------------------
7/22/2016 11:51:18 AMUglifyWriter                                  | 20284ms             
7/22/2016 11:51:18 AMUglifyWriter                                  | 16441ms             
7/22/2016 11:51:18 AMBabel                                         | 7106ms              
7/22/2016 11:51:18 AMBabel                                         | 6025ms              
7/22/2016 11:51:18 AMBabel                                         | 4509ms              
7/22/2016 11:51:18 AM
7/22/2016 11:51:18 AMSlowest Trees (cumulative)                    | Total (avg)         
7/22/2016 11:51:18 AM----------------------------------------------+---------------------
7/22/2016 11:51:18 AMUglifyWriter (2)                              | 36725ms (18362 ms)  
7/22/2016 11:51:18 AMBabel (18)                                    | 19736ms (1096 ms)   
7/22/2016 11:51:18 AM
7/22/2016 11:51:18 AM[?25hError: spawn /bin/sh ENOENT
7/22/2016 11:52:49 AM[?25h
7/22/2016 11:52:55 AM[?25hCould not start watchman; falling back to NodeWatcher for file system events.
7/22/2016 11:52:55 AM[?25hVisit http://ember-cli.com/user-guide/#watchman for more info.
7/22/2016 11:53:43 AM[?25l⠋ Building⠙ Building⠹ Building⠸ Building⠼ Building⠴ Building⠦ Building⠧ Building⠇ Building⠏ Building⠋ Building⠙ Building⠹ Building⠸ Building⠼ Building⠴ Building⠦ Building⠧ Building⠇ Building⠏ Building⠋ Building⠙ Building⠹ Building⠸ Building⠼ Building⠴ Building⠦ Building⠧ Building⠇ Building⠏ Building⠋ Building⠙ Building⠹ Building⠸ Building⠼ Building[?25hInstalling FastBoot npm dependencies
7/22/2016 11:53:44 AM[?25h
7/22/2016 11:53:44 AM[?25hBuild successful - 45861ms.
7/22/2016 11:53:44 AM
7/22/2016 11:53:44 AMSlowest Trees                                 | Total               
7/22/2016 11:53:44 AM----------------------------------------------+---------------------
7/22/2016 11:53:44 AMUglifyWriter                                  | 21139ms             
7/22/2016 11:53:44 AMUglifyWriter                                  | 17152ms             
7/22/2016 11:53:44 AM
7/22/2016 11:53:44 AMSlowest Trees (cumulative)                    | Total (avg)
7/22/2016 11:53:44 AM----------------------------------------------+---------------------
7/22/2016 11:53:44 AMUglifyWriter (2)                              | 38291ms (19145 ms)  
7/22/2016 11:53:44 AM
7/22/2016 11:53:50 AM[?25hEmber FastBoot running at http://[::]:8080