use default dockerignore in dockerfile directory

Author: commit111

samples/managed-llm/.dockerignore

@@ -1,7 +1,13 @@
 # Default .dockerignore file for Defang
 **/__pycache__
+**/.direnv
+**/.DS_Store
+**/.envrc
 **/.git
 **/.github
+**/.idea
+**/.next
+**/.vscode
 **/compose.*.yaml
 **/compose.*.yml
 **/compose.yaml
@@ -10,5 +16,12 @@
 **/docker-compose.*.yml
 **/docker-compose.yaml
 **/docker-compose.yml
+**/node_modules
+**/Thumbs.db
 Dockerfile
 *.Dockerfile
+# Ignore our own binary, but only in the root to avoid ignoring subfolders
+defang
+defang.exe
+# Ignore our project-level state
+.defang