systemd: add KNOT_ prefix to ZONE_LOAD_TIMEOUT_SEC

distro/common/knot.service

@@ -16,7 +16,7 @@ ExecReload=/bin/kill -HUP $MAINPID
 Restart=on-abort
 LimitNOFILE=1048576
 TimeoutStopSec=300
-Environment="ZONE_LOAD_TIMEOUT_SEC=180"
+Environment="KNOT_ZONE_LOAD_TIMEOUT_SEC=180"
 
 [Install]
 WantedBy=multi-user.target

src/knot/common/systemd.c

@@ -29,7 +29,7 @@ static int zone_load_timeout_s;
 
 static int systemd_zone_load_timeout(void)
 {
-	const char *timeout = getenv("ZONE_LOAD_TIMEOUT_SEC");
+	const char *timeout = getenv("KNOT_ZONE_LOAD_TIMEOUT_SEC");
 
 	int out;
 	if (timeout != NULL && timeout[0] != '\0' &&