Conditionalize CD based on success of CI

Author: Alex Evanczuk

.github/workflows/cd.yml

@@ -8,7 +8,7 @@ on:
 jobs:
   deploy:
     runs-on: ubuntu-latest
-
+    if: ${{ github.event.workflow_run.conclusion == 'success' }}
     steps:
       - uses: actions/checkout@8230315d06ad95c617244d2f265d237a1682d445
       - name: Tag and Push Gem