Use environment secrets for deployment (#1225)

Author: shahthepro

.github/workflows/ousd.yml

@@ -152,6 +152,7 @@ jobs:
     name: "Deploy App"
     runs-on: ubuntu-latest
     needs: [contracts-lint, dapp-lint]
+    environment: ${{github.ref_name}}
     env:
       HEROKU_TOKEN: ${{ secrets.HEROKU_TOKEN }}
       CURR_BRANCH: ${{ github.ref_name }}
@@ -166,6 +167,7 @@ jobs:
         uses: docker/setup-buildx-action@v2
 
       - name: Run Docker Login
+        if: ${{ contains(fromJSON('["staging", "stable"]'), github.ref_name) }}
         run: docker login --username =_ --password=$HEROKU_TOKEN registry.heroku.com
 
       - name: Identify Heroku App Name