Cirrus: Send cirrus-cron report e-mail to list.

This mailing-list was established to allow people to sub/unsub from
automated notifications.  Add it to the list of destinations picked up
by the Github Actions workflow
`.github/workflows/check_cirrus_cron.yml`.

Signed-off-by: Chris Evich <cevich@redhat.com>

.github/workflows/check_cirrus_cron.yml

@@ -6,6 +6,7 @@
 name: check_cirrus_cron
 
 on:
+    # Note: This only applies to the master branch.
     schedule:
         # Assume cirrus cron jobs runs at least once per day
         - cron:  '59 23 * * *'
@@ -54,6 +55,7 @@ jobs:
                 echo "# Source: ${{ github.workflow }} workflow on ${{ github.repository }}."
                 # Separate content from sendgrid.com automatic footer.
                 echo ""
+                echo ""
                 ) > ./artifacts/email_body.txt
 
             - if: steps.cron.outputs.failures > 0