doc debian

[gogo2464]

could be fun to document how to install zoekt on debian with build instruction included.

github action included!

[cla-bot]

Thank you for your pull request and welcome to our community. We could not parse the GitHub identity of the following contributors: gogo.
This is most likely caused by a git client misconfiguration; please make sure to:

1. check if your git client is configured with an email to sign commits git config --list | grep email
2. If not, set it up using git config --global user.email [email protected]
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[cla-bot]

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[gogo2464]

I am confused with the chapter 3 of sourcegraph cla. COuld you clarify please?