Shell script fails on Docker for windows -

i'm facing problem trying run image on docker windows.

i have dockerfile this:

from openjdk:8-jre-alpine workdir /myworkdir copy path/tomyproject/src/main/bin/start /myworkdir/start ... expose 8080  cmd [ "sh", "/myworkdir/start" ] 

and here piece fails on "start" file:

#!/bin/sh  script="$0" # set environment variables received command line i; case "$i" in   *=*) echo $i ;   key=${i%=*}   value=${i#*=};   export $key=$value esac done 

i have not problem building , running mac on windows (docker windows) can't run , got message:

: not found myworkdir/start: line 4: /myworkdir/start: line 6: syntax error: unexpected word (expecting "do")

if familiar , know how resolve it, please !!

try delete character \r in script start, example: sed -i 's/\r//g' start copy script start windows , rebuild image