Docker Compose sometimes failing on Windows because of line-endings

[TomKemperNL]

When building the project on windows, depending on git-settings the docker Solr container can fail:

Waiting up to 180 seconds to see Solr running on port 8983 [|] [/] [-] [\] [|] [/] [-] [\] [|] [/] [-] [\]

Started Solr server on port 8983 (pid=57). Happy searching!

/usr/bin/env: ‘sh\r’: No such file or directory

This is because the current line-ending of the solr/solr.sh file is left up to git, but it -has- to be LF since it's going to run on a linux-container.

Adding *.sh text eol=lf to the .gitattributes fixes this and removes this minor nag in getting the project to run on windows.