Suggest local files and folders when editing volume paths

[rcjsuen]

We should query the folder containing the Compose file and suggest files and folders for volume mappings.

services:
  db:
    image: postgres:17
    volumes:
      - ./db-data:/var/lib/postgresql/data
      - ./init:/docker-entrypoint-initdb.d
    ports:
      - 5432:5432