add docker compose and .env

.env

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+DATABASE_URL=postgres://apfel:apfel@localhost:5432/apfel
+JWT_SECRET_KEY=9b2cbd156a7a7e0e530acd780fdd16e8f37fa3fd8122c74a9b7e1ce6fc67980ed0e55572be4e382679a0c13d13f0a651d15e9e877bb579e957c899eb762b1bb4

crates/entity/src/lib.rs

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+//! `SeaORM` Entity, @generated by sea-orm-codegen 1.0.1
+
+pub mod prelude;

crates/entity/src/prelude.rs

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+//! `SeaORM` Entity, @generated by sea-orm-codegen 1.0.1

dev-compose.yml

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+services:
+  db:
+    container_name: apfelnetzwerk-postgres
+    image: postgres
+    environment:
+      POSTGRES_DB: apfel
+      POSTGRES_USER: apfel
+      POSTGRES_PASSWORD: apfel
+      PGDATA: /data/postgres
+    volumes:
+      - db:/data/postgres
+    ports:
+      - "5432:5432"
+    networks:
+      - db
+    restart: unless-stopped
+
+networks:
+  db:
+    driver: bridge
+
+volumes:
+  db: