Improve CI debugging: show container logs and status

Enhance the CI pipeline by adding steps to display Docker container logs and status information. Output recent log lines after MongoDB and app startup retries, and show full logs and container status before removal. These changes aid troubleshooting of container and application startup issues.

Author: KrzysztofPajak

.github/workflows/docker-image-pr.yml

@@ -25,6 +25,8 @@ jobs:
         for i in {1..10}; do
           nc -z localhost 27017 && echo "MongoDB is up" && break
           echo "Retrying in 3 seconds..."
+          echo "Container logs:"
+          docker logs grandnode2-container --tail 20
           sleep 3
         done
         
@@ -79,11 +81,20 @@ jobs:
           else
             echo "Received HTTP response code: $RESPONSE. Retrying in 3 seconds..."
           fi
+          echo "Container logs:"
+          docker logs grandnode2-container --tail 30
           sleep 3
         done
         echo "Application did not start successfully. Final response code: $RESPONSE"
         exit 1
-        
+
+    - name: Show container logs
+      run: |
+        echo "=== Full container logs ==="
+        docker logs grandnode2-container
+        echo "=== Container status ==="
+        docker inspect grandnode2-container --format='{{.State.Status}} - Exit: {{.State.ExitCode}}'
+
     - name: Stop and remove the container
       run: |
         docker stop grandnode2-container