fix: convert line endings to LF on checkout for all envs (casdoor#1448)

* Convert line endings to LF on checkout for all envs

* fix: convert line endings to LF on checkout for all envs

Author: ziranl16

.gitattributes

@@ -1,2 +1,5 @@
 *.go linguist-detectable=true
-*.js linguist-detectable=false
+*.js linguist-detectable=false
+# Declare files that will always have LF line endings on checkout.
+# Git will always convert line endings to LF on checkout. You should use this for files that must keep LF endings, even on Windows.
+*.sh text eol=lf