github actions: skip JIRA checks if secrets are unavailable

There are many workflows that are useful without the JIRA checks from
Forks.  We're still evaluating how to best deal with this without a lot
of engineer overhead to check extrenal contributors.

Author: PlaidCat

.github/workflows/validate-kernel-commits.yml

@@ -165,6 +165,7 @@ jobs:
 
       - name: Run JIRA PR Check
         id: jira_check
+        if: ${{ secrets.JIRA_API_TOKEN && secrets.JIRA_API_USER && secrets.JIRA_URL }} # Only run if JIRA credentials are available
         continue-on-error: true  # Allow PR comments to be posted before failing workflow
         env:
           JIRA_API_TOKEN: ${{ secrets.JIRA_API_TOKEN }}