Add a GitHub Workflow config file

Reason for Change
=================
* We should be able to deploy automatically from `main` to staging once merge is complete

Changes
=======
* Added a workflow config file
* Reference: https://github.com/marketplace/actions/deploy-to-heroku

Author: adarsh

.github/workflows/main.yml

@@ -0,0 +1,17 @@
+name: Deploy
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: akhileshns/[email protected] # This is the action
+        with:
+          heroku_api_key: ${{secrets.HEROKU_API_KEY}}
+          heroku_app_name: "cfp-next-staging" #Must be unique in Heroku
+          heroku_email: "[email protected]"