Allow manual heroku deployment

.github/workflows/deploy.yml

@@ -6,30 +6,33 @@ on:
   push:
     branches: [main]
 
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
 jobs:
   build:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
         uses: actions/checkout@v2
-      
+
       - name: Setup Node.js environment to run migrations
         uses: actions/setup-node@v3
-        with: 
-          node-version: '18.x'
+        with:
+          node-version: "18.x"
 
       - name: Install dependencies and run migrations
         working-directory: backend/
-        env: 
+        env:
           DATABASE_URL: ${{ secrets.DATABASE_URL }}
         run: |
           yarn install
           npx prisma migrate deploy
 
       - name: Build, Push and Release a Docker container to Heroku.
-        env: 
+        env:
           ENV_FILE: ${{ secrets.ENV_FILE }}
-        uses: gonuit/heroku-docker-deploy@v1.3.3 
+        uses: gonuit/heroku-docker-deploy@v1.3.3
         with:
           email: ${{ secrets.HEROKU_EMAIL }}