add docker-compose file and configure PostgreSQL service; update database credentials in app.py

docker-compose.yml

@@ -0,0 +1,16 @@
+services:
+  postgres:
+    image: postgres:16
+    container_name: ethnograph-postgres
+    restart: unless-stopped
+    environment:
+      POSTGRES_DB: ethnograph
+      POSTGRES_USER: ethnograph_user
+      POSTGRES_PASSWORD: ethnograph_pass
+    ports:
+      - "5432:5432"
+    volumes:
+      - pgdata:/var/lib/postgresql/data
+
+volumes:
+  pgdata:

server/app.py

@@ -2,7 +2,7 @@ from flask import Flask
 from db.database import Database
 
 app = Flask(__name__)
-db = Database(db_name='ethnograph', user='user', password='password')
+db = Database(db_name='ethnograph', user='ethnograph_user', password='ethnograph_pass')
 
 @app.route('/')
 def index():