add success to sim testing (#12118)

Co-authored-by: Julien Robert <julien@rbrt.fr>

.github/workflows/sims.yml

@@ -119,3 +119,20 @@ jobs:
           SLACK_COLOR: danger
           SLACK_MESSAGE: Sims are failing
           SLACK_FOOTER: ""
+
+  sims-success:
+    needs:
+      [test-sim-multi-seed-short, test-sim-after-import, test-sim-import-export]
+    if: ${{ success() }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Notify Slack on failure
+        uses: rtCamp/action-slack-notify@12e36fc18b0689399306c2e0b3e0f2978b7f1ee7
+        env:
+          SLACK_WEBHOOK: ${{ secrets.SLACK_WEBHOOK }}
+          SLACK_CHANNEL: cosmos-sdk-sims
+          SLACK_USERNAME: Sim Tests
+          SLACK_ICON_EMOJI: ":white_check_mark:"
+          SLACK_COLOR: good
+          SLACK_MESSAGE: Sims are passing
+          SLACK_FOOTER: ""