Added snyk as a blocking step

[jonathansmolenski]

This code adds snyk as a blocking step to the github actions build workflow

[skorper]

@jonathansmolenski if there's a high criticality vulnerability with no remediation will this still block the workflow?

[hkryeung]

@jonathansmolenski if there's a high criticality vulnerability with no remediation will this still block the workflow?

In cases where we're really in a pinch, we should be able to manually skip the step (conditions around it?)