Add Firebird log display on test failure in CI

When tests fail in CI, display the last 100 lines of the Firebird server log
to help with debugging. This includes:
- Firebird log from /firebird/log/firebird.log
- Docker container status
- Docker container logs (last 50 lines)

The step only runs when previous steps fail (using if: failure() condition)

Co-authored-by: mariuz <18359+mariuz@users.noreply.github.com>
Agent-Logs-Url: https://github.com/hgourvest/node-firebird/sessions/fe3ce41f-13f1-48f8-b28c-966edff92fe6

Author: Copilot

.github/workflows/node.js.yml

@@ -73,3 +73,21 @@ jobs:
       run: |
         export FIREBIRD_DATA=/firebird/data
         npm test
+
+    - name: Show Firebird log on failure
+      if: failure()
+      run: |
+        echo "=========================================="
+        echo "Firebird Server Log (last 100 lines):"
+        echo "=========================================="
+        docker exec firebird tail -n 100 /firebird/log/firebird.log || echo "Could not read firebird.log"
+        echo ""
+        echo "=========================================="
+        echo "Docker container status:"
+        echo "=========================================="
+        docker ps -a
+        echo ""
+        echo "=========================================="
+        echo "Docker container logs:"
+        echo "=========================================="
+        docker logs firebird --tail 50