Add action for production deployment (#237)

Author: julieg18

.github/workflows/deploy-master.yml

@@ -0,0 +1,18 @@
+name: Deploy Master
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: akhileshns/heroku-deploy@v3.12.12
+        with:
+          heroku_api_key: ${{secrets.HEROKU_API_KEY}}
+          heroku_app_name: 'cml-dev'
+          heroku_email: 'juliannagal18@gmail.com'
+          dontautocreate: true