test updating xpack license value

Author: RobsonSutton

.github/workflows/test.yml

@@ -58,12 +58,12 @@ jobs:
         image: docker.elastic.co/elasticsearch/elasticsearch:${{ matrix.elasticsearch }}
         env:
           discovery.type: single-node
+          xpack.license.self_generated.type: trial
           xpack.security.enabled: true
           xpack.watcher.enabled: true
           repositories.url.allowed_urls: https://example.com/*
           path.repo: /tmp
           ELASTIC_PASSWORD: ${{ env.ELASTIC_PASSWORD }}
-          LICENSE: trial
         ports:
           - 9200:9200
         options: --health-cmd="curl http://localhost:9200/_cluster/health" --health-interval=10s --health-timeout=5s --health-retries=10