Add .DS_Store and docker/ragflow-logs to the git ignore list (#523)

### What problem does this PR solve?

Ignore temporal files to help Mac developers.

### Type of change


- [x] Other (please describe):

Co-authored-by: PLIX870I <plix870i@V-SPDT-XIAOHUI-MB.local>

.gitignore

@@ -21,3 +21,9 @@ Cargo.lock
 
 .idea/
 .vscode/
+
+# Exclude Mac generated files
+.DS_Store
+
+# Exclude the log folder
+docker/ragflow-logs/