Add Action to execute remote workflow on config changes

.github/workflows/build-train.yml

@@ -0,0 +1,19 @@
+name: Run build train on config changes
+on:
+  push:
+    paths:
+      - 'config/*.config'
+
+jobs:
+
+  Run:
+    name: "Execute workflow"
+    if: ${{ github.repository_owner == 'Armbian' }}
+    runs-on: ubuntu-latest
+    steps:
+      - name: Repository Dispatch
+        uses: peter-evans/repository-dispatch@v2
+        with:
+          token: ${{ secrets.ACCESS_TOKEN }}
+          repository: armbian/os
+          event-type: "Repository update"