Set environment variables for GitHub Actions workflow

Environment variables `RAILS_ENV` and `DATABASE_URL` are now set earlier in the GitHub Actions workflow. This change provides better organization and makes sure that necessary variables are set before running the subsequent tasks.

.github/workflows/ci.yml

@@ -20,7 +20,9 @@ jobs:
           --health-interval 10s
           --health-timeout 5s
           --health-retries 5
-
+    env:
+      RAILS_ENV: test
+      DATABASE_URL: postgres://postgres:postgres@localhost:5432/pia_test
     steps:
       - name: Checkout code
         uses: actions/checkout@v3
@@ -32,9 +34,6 @@ jobs:
       - name: Set up database schema
         run: bin/rails db:schema:load
       - name: Run tests
-        env:
-          DATABASE_URL: postgres://postgres:postgres@localhost:5432/pia_test
-          RAILS_ENV: test
         run: bin/rails test
 
   lint: