feat(storefront): add SCHON_LANGUAGE_CODE support to Docker setup

Include SCHON_LANGUAGE_CODE as an environment variable in the `storefront.Dockerfile` and `docker-compose.yml`. This allows for configuring the language code dynamically, improving flexibility for multilingual setups.

Dockerfiles/storefront.Dockerfile

@@ -4,8 +4,10 @@ WORKDIR /app
 
 ARG SCHON_BASE_DOMAIN
 ARG SCHON_PROJECT_NAME
+ARG SCHON_LANGUAGE_CODE
 ENV SCHON_BASE_DOMAIN=$SCHON_BASE_DOMAIN
 ENV SCHON_PROJECT_NAME=$SCHON_PROJECT_NAME
+ENV SCHON_LANGUAGE_CODE=$SCHON_LANGUAGE_CODE
 
 COPY ./storefront/package.json ./storefront/package-lock.json ./
 RUN npm ci --include=optional

docker-compose.yml

@@ -224,6 +224,7 @@ services:
         - DEBUG=${DEBUG}
         - SCHON_BASE_DOMAIN=${SCHON_BASE_DOMAIN}
         - SCHON_PROJECT_NAME=${SCHON_PROJECT_NAME}
+        - SCHON_LANGUAGE_CODE=${SCHON_LANGUAGE_CODE}
     restart: always
     env_file:
       - .env