Specify environment in deploy staging Action (#634)

* Rename Action for clarity
* Set Action environment name to pick up correct secrets context

.github/workflows/push-staging.yml

@@ -1,15 +1,16 @@
 
-name: 'deploy'
+name: 'deploy-staging'
 
 on:
   # Triggers the workflow on branch and tag creation events
   create:
 
 jobs:
-  deploy:
+  deploy_staging:
     # Only deploy if it has the tag 'release'
     if: ${{ startsWith(github.ref, 'refs/tags/release') }}
     runs-on: ubuntu-latest
+    environment: Staging
     steps:
       - name: Cloning repo
         uses: actions/checkout@v2