Add action merge from

.github/workflows/merge-from-branch.yml

@@ -0,0 +1,55 @@
+name: Merge branch into nightly
+
+on:
+  workflow_dispatch:
+
+  workflow_call:
+    inputs:
+      branch:
+        required: true
+        type: string
+    secrets:
+      GPG_KEY2:
+        required: false
+      GPG_PASSPHRASE2:
+        required: false
+jobs:
+
+  Merge:
+
+    name: "Merge ${{ inputs.branch }} into nightly"
+    runs-on: [self-hosted, Linux]
+    if: ${{ github.repository_owner == 'Armbian' }}
+
+    steps:
+
+      - name: Checkout Armbian build script
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          repository: armbian/build
+          path: build
+          ref: nightly
+          clean: false
+
+      - name: Import GPG key
+        uses: crazy-max/ghaction-import-gpg@v3
+        with:
+          gpg-private-key: ${{ secrets.GPG_KEY2 }}
+          passphrase: ${{ secrets.GPG_PASSPHRASE2 }}
+          workdir: build
+          git-user-signingkey: true
+          git-commit-gpgsign: true
+
+      - name: Merge master into nightly
+
+        run: |
+          cd build
+          git config --global user.email "info@armbian.com"
+          git config --global user.name "Armbianworker"
+          git checkout master
+          git fetch
+          git merge origin/master
+          git checkout nightly
+          git merge master nightly
+          git push