Don't show redundent details on push vs pull request.

.github/workflows/ci-main.yml

@@ -20,7 +20,7 @@ jobs:
     steps:
       - uses: technote-space/workflow-conclusion-action@v2
       - uses: rjstone/discord-webhook-notify@v1
-        if: env.WORKFLOW_CONCLUSION == 'failure'
+        if: env.WORKFLOW_CONCLUSION == 'failure' && github.event_name == 'pull_request'
         with:
           severity: error
           webhookUrl: ${{ secrets.DISCORD_CI_WEBHOOK }}
@@ -30,6 +30,14 @@ jobs:
             ref - ${{ github.ref }}
             base_ref - ${{ github.base_ref }}
             head_ref - ${{ github.head_ref }}
+            committer - ${{ github.event_name }}
+      - uses: rjstone/discord-webhook-notify@v1
+        if: env.WORKFLOW_CONCLUSION == 'failure' && github.event_name == 'push'
+        with:
+          severity: error
+          webhookUrl: ${{ secrets.DISCORD_CI_WEBHOOK }}
+          details: |-
+            committer - ${{ github.event_name }}
 
   ubuntu-2004-scons-gcc-release-lto:
     runs-on: ubuntu-20.04