Add .gitattributes to ensure the bash file has the correct EOL

Author: Page-

.gitattributes

@@ -0,0 +1,6 @@
+# Set all files to use line feed endings (since we can't match only ones without an extension)
+* eol=lf
+# And then reset all the files with extensions back to default
+*.* -eol
+
+*.sh text eol=lf

test.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 set -o errexit
 
 function cleanup() {