ci: trigger api build on push to main

.github/workflows/ui-main.yml

@@ -41,3 +41,11 @@ jobs:
           registry: ecr
           context: ui
           dockerfile: ui/Dockerfile
+
+      - name: Trigger API Build
+        run: |
+          curl -X POST \
+            -H "Accept: application/vnd.github.v3+json" \
+            -H "Authorization: token ${{ secrets.GITHUB_TOKEN }}" \
+            https://api.github.com/repos/littlehorse-enterprises/lh-user-tasks-api/dispatches \
+            -d '{"event_type":"build","client_payload":{"repository":"${{ github.repository }}","sha":"${{ github.sha }}"}}'