Update merge-alertmanager.yaml

This commit removes the generation of the React assets because the React
UI has been abandoned in latest Alertmanager.

Signed-off-by: Simon Pasquier <spasquie@redhat.com>

Author: simonpasquier

.github/workflows/merge-alertmanager.yaml

@@ -26,16 +26,6 @@ jobs:
          .promu.yml
          go.mod
          go.sum
-      assets-cmd: |
-        # Only compress assets if assets actually changed
-        # The git diff relies on gits remote naming. The merge-flow checks out
-        # $downstream as origin at the time of writing this code.
-        if ! git diff --exit-code origin/main ui/react-app; then
-          make assets-compress
-          find ui/react-app -type f -name '*.gz' -exec git add {} \;
-          git add ui/react-app/embed.go
-          git diff --cached --exit-code || git commit -s -m "[bot] assets: generate"
-        fi
 
     secrets:
       pr-app-id: ${{ secrets.APP_ID }}