Add merge_branch workflow

Author: adamgraham

.github/workflows/docs.yml

@@ -0,0 +1,19 @@
+name: Merge Branch
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  merge-branch:
+    name: Merge Branch
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: everlytic/branch-merge@1.1.2
+        with:
+          github_token: ${{ secrets.DOCS_TOKEN }}
+          source_ref: 'main'
+          target_branch: 'docs'
+          commit_message_template: '[Automated] Merge {source_ref} into {target_branch}'