feat(docker): set default Docker to use Ollama (#1812)

docker-compose.yaml

@@ -1,13 +1,16 @@
 services:
   private-gpt:
     build:
-      dockerfile: Dockerfile.local
+      dockerfile: Dockerfile.external
     volumes:
       - ./local_data/:/home/worker/app/local_data
-      - ./models/:/home/worker/app/models
     ports:
       - 8001:8080
     environment:
       PORT: 8080
       PGPT_PROFILES: docker
-      PGPT_MODE: llamacpp
+      PGPT_MODE: ollama
+  ollama:
+    image: ollama/ollama:latest
+    volumes:
+      - ./models:/root/.ollama