fix: remove version declaration and adjust app service configuration in docker-compose

.devcontainer/docker-compose.yml

@@ -1,5 +1,3 @@
-version: '3'
-
 services:
   app:
     build:
@@ -8,7 +6,8 @@ services:
 
     volumes:
       - ../..:/workspaces:cached
-
+      - /var/run/docker.sock:/var/run/docker.sock
+    privileged: true
     # Overrides default command so things don't shut down after the process ends.
     command: sleep infinity
     ports: