Adding a git attributes file to avoid EOL issues

CRLF in .sh healthcheck scripts causes failures on Windows Docker

.gitattributes

@@ -0,0 +1,12 @@
+# Set default behavior to automatically normalize line endings.
+* text=auto
+
+# Force batch scripts to always use CRLF line endings so that if a repo is accessed
+# in Windows via a file share from Linux, the scripts will work.
+*.{cmd,[cC][mM][dD]} text eol=crlf
+*.{bat,[bB][aA][tT]} text eol=crlf
+*.{ics,[iI][cC][sS]} text eol=crlf
+
+# Force bash scripts to always use LF line endings so that if a repo is accessed
+# in Unix via a file share from Windows, the scripts will work.
+*.sh text eol=lf