Enhance Jenkinsfile with error handling for Docker Compose and add logging for E2E failures

- Introduced a new function to log detailed error information when the Docker Compose stack fails to start, including logs from Postgres and Keycloak containers.
- Updated the Docker Compose command to call the logging function upon failure, improving troubleshooting capabilities during CI runs.

Jenkinsfile

@@ -199,8 +199,23 @@ pipeline {
           }
           trap compose_down EXIT
           compose_down
+          e2e_compose_fail_logs() {
+            echo "== E2E: fallo al levantar stack; diagnóstico (revisa postgres-keycloak antes que keycloak) =="
+            export COMPOSE_PROJECT_NAME="${E2E_COMPOSE_PROJECT}"
+            echo "--- docker compose ps -a ---"
+            docker compose -f "$WORKSPACE/docker-compose.yml" ps -a 2>&1 || true
+            echo "--- logs: anexo76-postgres-a76 (Postgres app) ---"
+            docker logs --tail 250 anexo76-postgres-a76 2>&1 || true
+            echo "--- logs: anexo76-postgres-keycloak (Postgres de Keycloak; el healthcheck que suele fallar) ---"
+            docker logs --tail 400 anexo76-postgres-keycloak 2>&1 || true
+            echo "--- logs: anexo76-keycloak (servidor Keycloak; a veces no alcanzó a crearse) ---"
+            docker logs --tail 250 anexo76-keycloak 2>&1 || true
+          }
           # Stack completo (API, Keycloak, Vite) — puede tardar varios minutos la 1.ª vez
-          docker compose -f "$WORKSPACE/docker-compose.yml" up -d --build
+          if ! docker compose -f "$WORKSPACE/docker-compose.yml" up -d --build; then
+            e2e_compose_fail_logs
+            exit 1
+          fi
           bash "$WORKSPACE/scripts/wait-for-jenkins-stack.sh"
           # --network host: en Linux el contenedor de tests ve localhost:5173/8000 publicados por compose
           docker run --rm --network host \