When running Docker on Windows Docker is not able to properly adjust to
the line ending. When it builds the image from a Dockerfile that's
checked out with the Windows-style line endings (\r\n), and it runs a
command like
```Dockerfile
RUN <<EOF cat > /usr/bin/bashwrapper
echo "Hello world!"
EOF
```
it makes the filename `/usr/bin/bashwrapper\r`! This change works around
this problem by always using LF line endings for
`resources/docker-images/**/Dockerfile`.
