[DSEC-774] Edit Trivy workflow

[zbedo]

We should make sure to run Trivy even when there are no new PRs. This workflow will run weekly and when this repo has a new PR.

Relevant ticket

This PR:
Edits the Trivy workflow to run weekly and send messages in a Slack channel if it fails

When Job fails: https://github.com/DataBiosphere/hca-ingest/actions/runs/7803988683 a message was sent in a Slack channel

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ed8a144) 95.56% compared to head (1210583) 95.56%.
Report is 11 commits behind head on main.

❗ Current head 1210583 differs from pull request most recent head e07f394. Consider uploading reports for the commit e07f394 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #328   +/-   ##
=======================================
  Coverage   95.56%   95.56%           
=======================================
  Files           4        4           
  Lines         158      158           
  Branches        5        5           
=======================================
  Hits          151      151           
  Misses          7        7           

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[bahill]

Thank you!

[ahaessly]

👍