feat(ci): Trigger update flake lock pipeline on downstream repo

Author: galin-s

.github/workflows/trigger-downstream-flake-update.yml

@@ -0,0 +1,20 @@
+name: Trigger Downstream Flake Update on Push to Main
+
+on:
+  push:
+    branches:
+      - main # Or the branch you want to track
+
+jobs:
+  trigger-repo-b:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Trigger Downstream Pipeline
+        run: |
+          curl -L \
+            -X POST \
+            -H "Accept: application/vnd.github+json" \
+            -H "Authorization: token ${{ secrets.NIX_GITHUB_TOKEN }}" \
+            -H "X-GitHub-Api-Version: 2022-11-28" \
+            https://api.github.com/repos/metacraft-labs/nix-blockchain-development/dispatches \
+            -d '{"event_type":"flake-update","client_payload":{"unit":false,"integration":true}}'