Include build time in build.txt.
Include build time in build.txt.

andreasrosdal/freeciv-web,tltneon/freeciv-web,tltneon/freeciv-web,adaxi/freeciv-web,tltneon/freeciv-web,adaxi/freeciv-web,tltneon/freeciv-web,adaxi/freeciv-web,andreasrosdal/freeciv-web,tltneon/freeciv-web,andreasrosdal/freeciv-web,adaxi/freeciv-web,andreasrosdal/freeciv-web,tltneon/freeciv-web,adaxi/freeciv-web,andreasrosdal/freeciv-web