Address the issue of the absence of poetry in the development container. (#6036)

Co-authored-by: ox01024@163.com <Waffle>

.devcontainer/post_create_command.sh

@@ -1,6 +1,7 @@
 #!/bin/bash
 
 cd web && npm install
+pipx install poetry
 
 echo 'alias start-api="cd /workspaces/dify/api && flask run --host 0.0.0.0 --port=5001 --debug"' >> ~/.bashrc
 echo 'alias start-worker="cd /workspaces/dify/api && celery -A app.celery worker -P gevent -c 1 --loglevel INFO -Q dataset,generation,mail,ops_trace,app_deletion"' >> ~/.bashrc