Vulnerabilities: add govulncheck to Makefile and pipeline
We do not have any defined methods to check for vulnerabilities in our project. The go team recently introduced govulncheck as a method to check for vulnerabilities. Let's add this to the Makefile and pipeline and fix some vulnerabilities alongside.
This currently doesn't fail the pipeline, since that would require fixing all vulnerabilities. That would be the eventual goal.
Edited by Karthik Nayak