feat(ci): auto-dispatch homelab deploy after image push

.gitea/workflows/build.yml

@@ -39,4 +39,17 @@ jobs:
           tags: |
             ${{ env.IMAGE }}:latest
             ${{ env.IMAGE }}:${{ gitea.sha }}
-          provenance: false
+          provenance: false
+
+      # Hand off to the homelab stack: dispatch its deploy workflow so the swarm re-resolves
+      # :latest and rolls the homepage service. Deterministic — no agent involved. TOKEN_DEPLOY
+      # is the `deploy` bot (write:repository, write collaborator on ffaerber/homelab only).
+      - name: Trigger homelab deploy
+        env:
+          TD: ${{ secrets.TOKEN_DEPLOY }}
+        run: |
+          [ -n "$TD" ] || { echo "TOKEN_DEPLOY not set - skipping deploy dispatch"; exit 0; }
+          curl -sS -o /dev/null -w "homelab deploy dispatch -> HTTP %{http_code}\n" -X POST \
+            -H "Authorization: token $TD" -H "Content-Type: application/json" \
+            "${GITHUB_SERVER_URL}/api/v1/repos/ffaerber/homelab/actions/workflows/deploy.yml/dispatches" \
+            -d '{"ref":"main"}'