ci: Align PostgreSQL environment variables with Docker image

This commit updates the `ci.yml` workflow to use `POSTGRES_DB` and `POSTGRES_USER` instead of `POSTGRES_DATABASE` and `POSTGRES_USERNAME`.

This change aligns the environment variable names with the official PostgreSQL Docker image, ensuring correct database initialization in the CI environment.

Author: RandomProgramm3r

.github/workflows/ci.yml

@@ -45,8 +45,8 @@ jobs:
           echo "DJANGO_ALLOWED_HOSTS=localhost,127.0.0.1,0.0.0.0" >> .env
           echo "DJANGO_SECRET_KEY=${{ secrets.DJANGO_SECRET_KEY }}" >> .env
 
-          echo "POSTGRES_DATABASE=${{ secrets.POSTGRES_DATABASE }}" >> .env
-          echo "POSTGRES_USERNAME=${{ secrets.POSTGRES_USERNAME }}" >> .env
+          echo "POSTGRES_DB=${{ secrets.POSTGRES_DB }}" >> .env
+          echo "POSTGRES_USER=${{ secrets.POSTGRES_USER }}" >> .env
           echo "POSTGRES_PASSWORD=${{ secrets.POSTGRES_PASSWORD }}" >> .env
 
           echo "ANTIFRAUD_INTERNAL_PORT=8081" >> .env