rename workflow

Author: ks6088ts

.github/workflows/post_summary_to_slack.yaml renamed to .github/workflows/news_summarizer_agent.yaml

@@ -1,4 +1,4 @@
-name: post_summary_to_slack
+name: news_summarizer_agent
 
 on:
   workflow_dispatch:
@@ -43,7 +43,7 @@ env:
   SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
 
 jobs:
-  post_summary_to_slack:
+  news_summarizer_agent:
     runs-on: "ubuntu-latest"
     timeout-minutes: 5
     steps: