Add heroku action

.github/workflows/main.yml

@@ -0,0 +1,17 @@
+name: Deploy
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: akhileshns/heroku-deploy@v3.3.6
+        with:
+          heroku_api_key: ${{secrets.HEROKU_API_KEY}}
+          heroku_app_name: "sj-staffmanagement"
+          heroku_email: ${{secrets.HEROKU_EMAIL}}