Loki integration with Grafana agent hosted in Docker

[it2008018]

Edit: seems everything is right in this setup, I was searching logs with wrong query. Searching with {job="varlogs"} is showing the results.
I am trying to send logs to Loki Grafana cloud via Grafana agent hosted in Docker. I am following this instructions where the grafana agent is hosted in Linux Node, however I have hosted my agent in docker (attached docker-compose and agent-config file). I can see the traces are getting projected in Tempo but logs are not projected in Loki.
Is there any configuration missing in the docker files which need to be done for docker instance or this instruction is specifically for linux machines?

Code in startup.cs:

Nuget packages installed:

Docker files:

agent-config.txt
docker-compose.txt

Tempo showing traces:

No logs grabbed in Loki:

Console window showing logs and traces: