Pass Shopify env vars into container via docker-compose

Variables in .env are only available to docker compose for interpolation,
not automatically passed into the container — must be listed explicitly.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -20,6 +20,9 @@ services:
       CACHE_DRIVER: file
       QUEUE_CONNECTION: sync
       LOG_CHANNEL: stderr
+      SHOPIFY_SHOP_DOMAIN: "${SHOPIFY_SHOP_DOMAIN}"
+      SHOPIFY_ACCESS_TOKEN: "${SHOPIFY_ACCESS_TOKEN}"
+      SHOPIFY_WEBHOOK_SECRET: "${SHOPIFY_WEBHOOK_SECRET}"
     volumes:
       - storage_uploads:/app/storage/app
       - storage_logs:/app/storage/logs