Send push event header to GitOps webhook

The post-build webhook returned success while ignoring the delivery because it omitted X-Gitea-Event: push. As a result, GitSource kept the prior revision and the published console image was never reconciled. Add the event header so the signed notification is queued only after the image has been published.

.gitea/workflows/build.yaml

@@ -40,6 +40,7 @@ jobs:
           curl --fail --silent --show-error \
             -X POST \
             -H "Content-Type: application/json" \
+            -H "X-Gitea-Event: push" \
             -H "X-Gitea-Signature: $signature" \
             --data-binary "@$payload" \
             https://ui.k6n.net/api/gitops/webhooks/gitea