Fixing gitspiegel trigger workflow (#541)

.github/workflows/gitspiegel-trigger.yml

@@ -1,5 +1,10 @@
 name: gitspiegel sync
 
+# This workflow doesn't do anything, it's only use is to trigger "workflow_run"
+# webhook, that'll be consumed by gitspiegel
+# This way, gitspiegel won't do mirroring, unless this workflow runs,
+# and running the workflow is protected by GitHub
+
 on:
   pull_request:
     types:
@@ -13,8 +18,5 @@ jobs:
   sync:
     runs-on: ubuntu-latest
     steps:
-      - name: Trigger sync via API
-        run: |
-          curl --fail-with-body -XPOST "https://gitspiegel.parity-prod.parity.io/api/v1/mirror/${{ github.repository }}/pull/${{ github.event.number }}" \
-           -H "Content-Type: application/json" \
-           -H "x-auth: ${{ secrets.GITSPIEGEL_TOKEN }}"
+      - name: Do nothing
+        run: echo "let's go"