Fix frontend build by including Filament CSS in Docker

Dockerfile

@@ -1,18 +1,6 @@
 # syntax=docker/dockerfile:1
 
-FROM node:20-alpine AS frontend_build
-
-WORKDIR /var/www/html
-
-COPY package*.json ./
-RUN npm ci --ignore-scripts
-
-COPY resources resources
-COPY postcss.config.js tailwind.config.js vite.config.mjs jsconfig.json ./
-
-RUN npm run build
-
-FROM php:8.3-fpm-alpine AS php_build
+FROM php:8.3-fpm-alpine AS php_deps
 
 ENV COMPOSER_ALLOW_SUPERUSER=1
 
@@ -60,6 +48,21 @@ COPY . .
 RUN set -eux; \
     composer install --no-dev --prefer-dist --optimize-autoloader --no-interaction --no-progress --no-scripts
 
+FROM node:20-alpine AS frontend_build
+
+WORKDIR /var/www/html
+
+COPY package*.json ./
+RUN npm ci --ignore-scripts
+
+COPY resources resources
+COPY postcss.config.js tailwind.config.js vite.config.mjs jsconfig.json ./
+COPY --from=php_deps /var/www/html/vendor/filament/filament/resources/css/theme.css /var/www/html/vendor/filament/filament/resources/css/theme.css
+
+RUN npm run build
+
+FROM php_deps AS php_build
+
 COPY --from=frontend_build /var/www/html/public/build /var/www/html/public/build
 
 RUN set -eux; \