CI in PR's fails because of build_docs job

[Omri Bar-Zik]

Expected Behavior

The build_docs job should not run when creating PR

We should add a check to the job to run only when the PR push to the master like in the release job.

Actual Behavior

The build_docs job run and make the CI fails

Steps to Re-produce the Problem

1. create PR in a fork

Context

Not related

• Operating System:
• Node.js version (run node --version):
• Package version:
• Docker version (run docker --version):
• Is docker installed locally?
• Do you have containers created?
• Does this file exists /var/run/docker.sock ?
• Output of docker info:

[Liran Tal]

Fixed in #161