Timezone Variable Required

[yousefmansy1]

Hey I know this is a small project but these two issues led me here
AdguardTeam/AdGuardHome#4645
AdguardTeam/AdGuardHome#2290

When using the docker image you provided I was getting these errors.

[16:22:00.377] ERROR (1): Error
[16:22:00.377] ERROR (1): Cannot read properties of undefined (reading 'valueOf')
[16:22:00.377] ERROR (1): TypeError: Cannot read properties of undefined (reading 'valueOf')
    at /usr/src/app/outputs/loki.js:20:90
    at Array.map (<anonymous>)
    at LokiApi.push (/usr/src/app/outputs/loki.js:19:34)
    at /usr/src/app/index.js:107:39
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async AdguardApi.getLogs (/usr/src/app/adguard/index.js:60:24)
    at async syncLogs (/usr/src/app/index.js:104:5)

There's quite a few "Undocumented" (in the readme) args. And I think the timezone arg is required because otherwise it cant generate the timestamp for the log when sending it to loki.

adguard-loki-exporter/index.js

Lines 14 to 23 in 28193c2

	program
	.option('-aurl, --adguard-url <char>', 'Adguard URL (http://127.0.0.1:8080)', process.env.ADGUARD_URL)
	.option('-auser, --adguard-user <char>', 'Adguard user', process.env.ADGUARD_USER)
	.option('-apass, --adguard-password <char>', 'Adguard password', process.env.ADGUARD_PASSWORD)
	.option('-lurl --loki-url <char>', 'Loki url (http://127.0.0.1:3100)', process.env.LOKI_URL)
	.option('-hurl --http-url <char>', 'http url (http://127.0.0.1:12203)', process.env.HTTP_URL)
	.option('-tz --timezone <char>', 'Set timezone for message to loki', process.env.TIMEZONE)
	.option('-cron --cron-schedule <char>', 'Corn Job schedule', process.env.CRON_SCHEDULE || '* * * * *')
	.option('-port --api-port <char>', 'API Port', process.env.API_PORT || '8080')
	.option('-p --pointer-path <char>', 'The pointer path', process.env.POINTER_PATH);

I passed in the TIMEZONE arg and it started to work again, a default value here is probably helpful.