Priklopi pgdata za PostgreSQL 18, dodaj healthcheck in db:prepare ob zagonu

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

docker-compose.yml

@@ -6,7 +6,7 @@ services:
       dockerfile: Dockerfile
       args:
         PG_MAJOR: ${PG_MAJOR:-18}
-    command: bin/rails server -b 0.0.0.0 -p 3000
+    command: bash -c "bin/rails db:prepare && bin/rails server -b 0.0.0.0 -p 3000"
     ports:
       - "3000:3000"
     env_file: .env
@@ -21,7 +21,8 @@ services:
       - .:/app
       - bundle:/usr/local/bundle
     depends_on:
-      - db
+      db:
+        condition: service_healthy
 
   db:
     image: postgres:${PG_MAJOR:-18}
@@ -30,7 +31,12 @@ services:
       POSTGRES_USER: ${APP_DATABASE_USERNAME}
       POSTGRES_PASSWORD: ${APP_DATABASE_PASSWORD}
     volumes:
-      - pgdata:/var/lib/postgresql/data
+      - pgdata:/var/lib/postgresql
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U $${POSTGRES_USER} -d $${POSTGRES_DB}"]
+      interval: 2s
+      timeout: 5s
+      retries: 15
 
 volumes:
   pgdata: