LOG_LEVEL env variable is ignored

[kri164]

Describe the bug

I running gravity as systemd service. Part of unity file:

[Service]
User=gravity
Group=gravity
WorkingDirectory=/var/lib/gravity
Environment="DATA_PATH=/var/lib/gravity"
Environment="LOG_LEVEL=error"
ExecStart=/usr/bin/gravity server
StandardOutput=append:/var/log/gravity.log
StandardError=append:/var/log/gravity.err.log

Expected behavior

Log file should contain errors only. But defaul info level is used instead.

cat /var/log/gravity.log
{"level":"info","ts":1762932167.3104582,"logger":"role.etcd","msg":"starting embedded etcd","instance":"","version":"0.28.
7"}
{"level":"warn","ts":1762932167.3105087,"logger":"role.etcd","msg":"Running http and grpc server on single port. This is n
ot recommended for production.","instance":"","version":"0.28.7"}
{"level":"info","ts":1762932167.3105204,"logger":"role.etcd","msg":"configuring peer listeners","instance":"","version":"0
.28.7","listen-peer-urls":["https://0.0.0.0:2380"]}

Version and Deployment (please complete the following information):

• Gravity version: v0.28.7
• Deployment: systemd service (simple binary and unity file)

systemctl daemon-reload was applied after unity file edit of course.