Docs: avd-lab-guide.md - set LABPASSPHRASE in zsh config

[mjbear]

Hello Arista Engineering people,

On the heels of issue #148, I have a suggestion that the method for setting LABPASSPHRASE. For the students' benefit, it should still be explained early in the avd-lab-guide.md, but be made an (automatic) entry in the zsh config as a usability/life improvement when opening new shells. 😁

I'm game to include this in a PR (most likely along with #148 should that be blessed).

Thoughts?

Thank you!

[JulioPDX]

If you want to add this to the zsh file, that would have to be done under the ATD repo, within the nested-release branch. We leverage the ATD environment but this repository doesn't manage the ATDs.

[JulioPDX]

For example, within the code container Dockerfile

[mjbear]

For example, within the code container Dockerfile

Understood, thank you.
I opened an issue over on atd-public.

Since this actual change would occur in atd-public if approved, I will be closing this issue.