Ensure *.sh are LF-style, so that they can be used directly by Docker for Windows (#5793)

.gitattributes

@@ -0,0 +1,7 @@
+# Ensure that .sh scripts use LF as line separator, even if they are checked out
+# to Windows(NTFS) file-system, by a user of Docker for Window. 
+# These .sh scripts will be run from the Container after `docker compose up -d`.
+# If they appear to be CRLF style, Dash from the Container will fail to execute
+# them.
+
+*.sh      text eol=lf