read special boarding button announcement at Bowdoin

[panentheos]

Summary of changes

Asana Ticket: Record and implement new audio at Bowdoin (trains to Wonderland)

This adds a special announcement to boarding messages at Bowdoin eastbound.

[github-actions]

Coverage of commit d645163

Summary coverage rate:
  lines......: 75.5% (1919 of 2543 lines)
  functions..: 76.7% (520 of 678 functions)
  branches...: no data found

Files changed coverage rate:
                                                             |Lines       |Functions  |Branches    
  Filename                                                   |Rate     Num|Rate    Num|Rate     Num
  =================================================================================================
  lib/content/audio/boarding_button.ex                       |50.0%      2|50.0%     4|    -      0
  lib/content/audio/predictions.ex                           |98.1%     54| 100%     1|    -      0
  lib/content/message/predictions.ex                         |56.7%    120|66.7%    15|    -      0
  lib/signs/utilities/predictions.ex                         |96.9%     64| 100%    10|    -      0

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[PaulJKim]

Looks good to me!