Attempt codespaces fix

Author: chriscarrollsmith

.devcontainer/docker-compose.yml

@@ -7,8 +7,6 @@ services:
     working_dir: /workspaces/fastapi-jinja2-postgres-webapp
     depends_on:
       - db
-    env_file:
-      - ../.env
     command: sleep infinity
 
   # Override/augment settings for the db service defined in the root compose file

docker-compose.yml

@@ -2,11 +2,11 @@ services:
   db:
     image: postgres:latest
     environment:
-      POSTGRES_USER: ${DB_USER}
-      POSTGRES_PASSWORD: ${DB_PASSWORD}
-      POSTGRES_DB: ${DB_NAME}
+      POSTGRES_USER: ${DB_USER:-postgres}
+      POSTGRES_PASSWORD: ${DB_PASSWORD:-postgres}
+      POSTGRES_DB: ${DB_NAME:-fastapi-jinja2-postgres-webapp}
     ports:
-      - "${DB_PORT}:5432"
+      - "${DB_PORT:-5432}:5432"
     volumes:
       - postgres_data:/var/lib/postgresql/data