Docker is driving me insane today. Can anyone with more #docker experience than me tell me what the hell is going on here?

http://pastie.org/p/7mawF0VfKcqX8bZtfOkrgC/raw

The file clearly exists and is executable, but whatever I try, it always ends up not being found when I actually want to execute it in the next step. 

 Are you using a separare build container? See the "Removed intermediate container" message one step before the deno call.  

 There seem to be problems with Deno on basic Alpine base images, and the error is just as unhelpful as it could possibly be. :/