allow some env settings for ingest manager (elastic#72544)

Author: graphaelli

src/dev/build/tasks/os_packages/docker_generator/resources/bin/kibana-docker

@@ -174,6 +174,8 @@ kibana_vars=(
     xpack.infra.sources.default.fields.timestamp
     xpack.infra.sources.default.logAlias
     xpack.infra.sources.default.metricAlias
+    xpack.ingestManager.fleet.tlsCheckDisabled
+    xpack.ingestManager.registryUrl
     xpack.license_management.enabled
     xpack.ml.enabled
     xpack.reporting.capture.browser.autoDownload