Fix Docker Compose and Dockerfile issues: remove image pull, fix entrypoint permissions

docker-compose.yml

@@ -1,5 +1,3 @@
-version: '3.8'
-
 # ============================================================================
 # Nerd Monitor Docker Compose Configuration
 # ============================================================================
@@ -40,7 +38,6 @@ services:
       context: .
       dockerfile: Dockerfile.server
     container_name: nerd-monitor-server
-    image: nerd-monitor-server:latest
     ports:
       - "8080:8080"
     environment:
@@ -82,7 +79,6 @@ services:
     build:
       context: .
       dockerfile: Dockerfile.agent
-    image: nerd-monitor-agent:latest
     environment:
       # Agent configuration
       SERVER: "server:8080"        # Connect to the server service