examples: explicitly set tzdir for clickhouse

Author: sandydoo

src/modules/services/clickhouse.nix

@@ -52,7 +52,12 @@ in
           path: ${cfg.package}/etc//clickhouse-server/users.xml
     '';
     processes.clickhouse-server = {
-      exec = "clickhouse-server --config-file=${pkgs.writeText "clickhouse-config.yaml" cfg.config}";
+      exec = ''
+        ${lib.optionalString pkgs.stdenv.isLinux ''
+          export TZDIR='${pkgs.tzdata}/share/zoneinfo'
+        ''}
+        exec clickhouse-server --config-file='${pkgs.writeText "clickhouse-config.yaml" cfg.config}'
+      '';
 
       process-compose = {
         readiness_probe = {