Chain Portainer redeploy to the end of the build workflow, not a parallel webhook

The separate Gitea push webhook to Portainer fired in parallel with this
build workflow on the same push event, so it could redeploy before the
new image finished pushing — Portainer would then pull the still-current
:latest tag and silently keep running old code. Removed that webhook;
redeploy now only happens as this workflow's last step, after the image
push actually completes.

.gitea/workflows/build.yml

@@ -31,3 +31,10 @@ jobs:
           IMAGE="${{ vars.REGISTRY_HOST }}/${{ gitea.repository }}/claude-agent:latest"
           docker build -t "$IMAGE" ./agent
           docker push "$IMAGE"
+
+      - name: Trigger Portainer redeploy
+        # Deliberately NOT a separate Gitea repo webhook firing in parallel on the same
+        # push — that raced with this build and could redeploy before the new image was
+        # actually pushed, silently keeping the old code running. Chaining it here as the
+        # last step guarantees the image exists before Portainer goes to pull it.
+        run: curl -f -X POST "${{ secrets.PORTAINER_WEBHOOK_URL }}"