Assemble needed runs into a GH Actions build train

.github/workflows/build-beta-desktop.yml

@@ -2,9 +2,6 @@ name: Beta Desktop
 
 on:
   workflow_dispatch:
-  workflow_run:
-    workflows: ["Beta Kernel"]
-    types: [completed]
 
 jobs:
 

.github/workflows/build-beta-images.yml

@@ -5,11 +5,26 @@ on:
 
 jobs:
 
+  fake:
+    runs-on: ubuntu-latest
+    name: Source changes
+    if: ${{ github.repository_owner == 'Armbian' }}
+    steps:
+      - run: |
+          echo "not empty" > changes
+      - uses: actions/upload-artifact@v2
+        with:
+          path: changes
+          name: changes
+          if-no-files-found: ignore
+
   merge:
-    uses: armbian/scripts/.github/workflows/merge-from-branch.yml@master
+    needs: [ fake ]
+    uses: armbian/scripts/.github/workflows/merge-from-branch.yml@master    
 
     with:
       branch: 'nightly'
+      runner: small
 
     secrets:  
       GPG_KEY2: ${{ secrets.GPG_KEY2 }}