ci: Add worflow to run trivy scan on public repos

[terminus-devops]

This PR adds a workflow to run trivy scan against each PR to default branch.

[github-actions]

Trivy Scan Report:

No vulnerabilities(HIGH/CRITICAL) found!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.13%. Comparing base (ef9b3c3) to head (c0e80f0).

Additional details and impacted files

@@           Coverage Diff            @@
##           release     #680   +/-   ##
========================================
  Coverage    91.13%   91.13%           
========================================
  Files           39       39           
  Lines          485      485           
  Branches        89       89           
========================================
  Hits           442      442           
  Misses          43       43           

Flag	Coverage Δ
browser	100.00% <ø> (ø)
coercion	?
jwt	88.16% <ø> (ø)
keycodes	?
regex	?
testing	?
type-guards	98.00% <ø> (ø)
utilities	?

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