Update main.yml

Display gh context actor and head ref

Author: jorgecotillo

.github/workflows/main.yml

@@ -15,6 +15,11 @@ jobs:
         uses: actions/setup-node@v2.1.2
         with:
           node-version: 10.x
+      
+      - name: GitHub context (actor and head ref)
+        run: |          
+          echo ${{ github.actor }}
+          echo ${{ github.head_ref }}
 
       - name: Install NPM modules
         run: npm ci