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

@@ -158,13 +158,15 @@ jobs:
           pip install jira
 
       - name: Mask JIRA credentials
+        if: secrets.JIRA_API_TOKEN != '' && secrets.JIRA_API_USER != '' && secrets.JIRA_URL != ''
         run: |
           echo "::add-mask::${{ secrets.JIRA_API_TOKEN }}"
           echo "::add-mask::${{ secrets.JIRA_API_USER }}"
           echo "::add-mask::${{ secrets.JIRA_URL }}"
 
       - name: Run JIRA PR Check
         id: jira_check
+        if: secrets.JIRA_API_TOKEN != '' && secrets.JIRA_API_USER != '' && secrets.JIRA_URL != ''
         continue-on-error: true  # Allow PR comments to be posted before failing workflow
         env:
           JIRA_API_TOKEN: ${{ secrets.JIRA_API_TOKEN }}