Fix minor security vulnerability when triggering CI (#898)

Fix bug when triggering CI
Signed-off-by: Tim Moon <tmoon@nvidia.com>

.github/workflows/blossom-ci.yml

@@ -24,7 +24,7 @@ jobs:
 
     # This job only runs for pull request comments
     if: |
-         contains( 'ptrendx,ksivaman,', format('{0},', github.actor)) &&
+         contains( ',ptrendx,ksivaman,', format(',{0},', github.actor)) &&
          github.event.comment.body == '/blossom-ci'
     steps:
       - name: Check if comment is issued by authorized person

.github/workflows/trigger-ci.yml

@@ -16,7 +16,7 @@ jobs:
 
     # This job only runs for pull request comments
     if: |
-         contains( 'ptrendx,ksivaman,schetlur-nv,timmoon10,zlsh80826,mingxu1067,cyanguwa,nzmora-nvidia,galagam,nouiz,denera,sudhakarsingh27,Oleg-Goncharov,phu0ngng,nvcforster,', format('{0},', github.actor)) &&
+         contains( ',ptrendx,ksivaman,schetlur-nv,timmoon10,zlsh80826,mingxu1067,cyanguwa,nzmora-nvidia,galagam,nouiz,denera,sudhakarsingh27,Oleg-Goncharov,phu0ngng,nvcforster,', format(',{0},', github.actor)) &&
          startsWith(github.event.comment.body, '/te-ci')
     steps:
       - name: Check if comment is issued by authorized person