sync: remove stale trigger.yaml

.forgejo/workflows/trigger.yaml

@@ -1,18 +0,0 @@
-name: Trigger CI Pipeline
-
-on:
-  push:
-    branches:
-      - deployment
-
-jobs:
-  dispatch:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Trigger build in ci-pipelines repo
-        run: |
-          curl -s -X POST \
-            "http://forgejo.tooling.svc.cluster.local:3000/api/v1/repos/ember/ci-pipelines/dispatches" \
-            -H "Authorization: token ${{ secrets.CI_DISPATCH_TOKEN }}" \
-            -H "Content-Type: application/json" \
-            -d '{"event_type": "continuwuity-push", "client_payload": {"ref": "${{ github.ref }}", "sha": "${{ github.sha }}"}}'