BUG: setup timezone in deploy

Summary

Tests the time zone setting of the server, see caosdb-server!69 (merged)

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.docker/docker-compose.yml

@@ -32,7 +32,7 @@ services:
       - "10080:10080"
     environment:
       DEBUG: 1
-      DOCKER_TZ: "Cuba"
+      CAOSDB_CONFIG_TIMEZONE: "Cuba"
       CAOSDB_CONFIG_AUTHTOKEN_CONFIG: "conf/core/authtoken.example.yaml"
       CAOSDB_CONFIG_TRANSACTION_BENCHMARK_ENABLED: "TRUE"
       CAOSDB_CONFIG__CAOSDB_INTEGRATION_TEST_SUITE_KEY: _CAOSDB_PYINTTEST_SUITE