Update device-agent_docker.env

[ajcraig]

small update to the docker.env to point to main branch.

[singhmj-1]

The default value should be main branch, hence approving. Just one thing on mind, what should we do with these variables when we create release tags? Should be auto-generated via some pipeline or should leave it to the user to configure it?

we can ignore this as I am creating the single env file for device-agent aslo. Device type is identified during script execution with following commands.

sudo -E bash device-agent.sh docker # for docker-compose device
sudo -E bash device-agent.sh k3s # for k3s device

Refer updated setup guide: https://github.com/margo/sandbox/blob/dev-sprint-12/docs/setup-guide.md

[vireshnavalli]

The default value should be main branch, hence approving. Just one thing on mind, what should we do with these variables when we create release tags? Should be auto-generated via some pipeline or should leave it to the user to configure it?

this has been handled as part of #163 ( we can use tags also once this PR merged to main). It is better to leave user to configure.