Začetna predloga za Rails razvojno okolje v Dockerju

- Dockerfile na osnovi ruby:4.0.9-slim z razvojnimi orodji in
  klientom PostgreSQL iz repozitorija PGDG
- docker-compose.yml s servisoma app (Rails) in db (PostgreSQL)
- .env.example, .dockerignore in .gitignore
- README z opisom sklada in navodili za nov projekt

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docker-compose.yml

@@ -0,0 +1,37 @@
+services:
+  app:
+    user: "1000:1000"
+    build:
+      context: .
+      dockerfile: Dockerfile
+      args:
+        PG_MAJOR: ${PG_MAJOR:-18}
+    command: bin/rails server -b 0.0.0.0 -p 3000
+    ports:
+      - "3000:3000"
+    env_file: .env
+    environment:
+      RAILS_ENV: development
+      APP_DATABASE: ${APP_DATABASE}
+      APP_DATABASE_HOST: ${APP_DATABASE_HOST}
+      APP_DATABASE_PORT: ${APP_DATABASE_PORT}
+      APP_DATABASE_USERNAME: ${APP_DATABASE_USERNAME}
+      APP_DATABASE_PASSWORD: ${APP_DATABASE_PASSWORD}
+    volumes:
+      - .:/app
+      - bundle:/usr/local/bundle
+    depends_on:
+      - db
+
+  db:
+    image: postgres:${PG_MAJOR:-18}
+    environment:
+      POSTGRES_DB: ${APP_DATABASE}
+      POSTGRES_USER: ${APP_DATABASE_USERNAME}
+      POSTGRES_PASSWORD: ${APP_DATABASE_PASSWORD}
+    volumes:
+      - pgdata:/var/lib/postgresql/data
+
+volumes:
+  pgdata:
+  bundle: