move automerge into its own file

Author: jorgecotillo

.github/workflows/automerge.yml

@@ -0,0 +1,40 @@
+name: CI
+
+on:
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v2.1.2
+        with:
+          node-version: 10.x
+
+      - name: Check RP in Autogenlist
+        if: ${{ github.actor == 'AzureSDKAutomation' && startsWith(github.head_ref, 'sdkAutomation') }}
+        run: |
+          check_result='';
+          exec=$(npm run find-basepath ${{ github.head_ref }}); 
+          while read line; 
+          do
+            # overriding check_result until the last line is read, last line contains
+            # the result to whether or not the basepath was found in autogenlist.
+            check_result=$line; 
+            echo $check_result;
+          done <<< "$exec";
+          
+          echo "AUTOGENLIST_CHECK_RESULT=$check_result" >> $GITHUB_ENV;
+        working-directory: ./generator
+
+      - name: Automerge
+        if: ${{ github.actor == 'AzureSDKAutomation' && startsWith(github.head_ref, 'sdkAutomation') && env.AUTOGENLIST_CHECK_RESULT == 'true' }}
+        uses: "pascalgn/automerge-action@v0.12.0"
+        env:
+          GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"          
+          MERGE_LABELS: ""