Update github-action-variable-01.yml

Author: yejipo

.github/workflows/github-action-variable-01.yml

@@ -15,6 +15,7 @@ jobs:
       MESSAGE: Hello
     steps:
       - name: "It's Day!"
+        if: ${{ env.DAY_OF_WEEK == 'Thursday'}}
         run: echo "$MESSAGE, Today is $DAY_OF_WEEK!"