fix: migrate Dockerfile to php:8.4-fpm-alpine to restore native IMAP support

Dockerfile

@@ -1,25 +1,31 @@
-FROM php:8.4-fpm
+FROM php:8.4-fpm-alpine
 
 # Install system dependencies
-RUN apt-get update && apt-get install -y \
+RUN apk add --no-cache \
     git \
     curl \
     libpng-dev \
-    libonig-dev \
+    oniguruma-dev \
     libxml2-dev \
     zip \
     unzip \
     nginx \
     supervisor \
-    libc-client-dev \
-    libkrb5-dev \
-    && rm -rf /var/lib/apt/lists/*
+    imap-dev \
+    krb5-dev \
+    linux-headers \
+    nodejs \
+    npm \
+    bash \
+    icu-dev \
+    $PHPIZE_DEPS
 
 # Configure and install PHP extensions
 RUN docker-php-ext-configure imap --with-kerberos --with-imap-ssl \
     && docker-php-ext-install pdo_mysql mbstring exif pcntl bcmath gd intl imap \
     && pecl install redis \
-    && docker-php-ext-enable redis
+    && docker-php-ext-enable redis \
+    && apk del $PHPIZE_DEPS
 
 # Install Composer
 COPY --from=composer:latest /usr/bin/composer /usr/bin/composer
@@ -30,28 +36,27 @@ WORKDIR /var/www
 # Copy existing application directory contents
 COPY . /var/www
 
-# Install PHP dependencies
-RUN composer install --no-interaction --no-dev --optimize-autoloader
+# Install PHP/Node dependencies and build frontend
+RUN composer install --no-interaction --no-dev --optimize-autoloader \
+    && npm install \
+    && npm run build \
+    && npm cache clean --force
 
 # Nginx config
-COPY .docker/nginx.conf /etc/nginx/sites-available/default
-RUN rm -rf /etc/nginx/sites-enabled/default && ln -s /etc/nginx/sites-available/default /etc/nginx/sites-enabled/default
+# Alpine uses http.d instead of sites-available
+COPY .docker/nginx.conf /etc/nginx/http.d/default.conf
 
 # Supervisor config
+RUN mkdir -p /etc/supervisor/conf.d /var/log/supervisor
 COPY .docker/supervisord.conf /etc/supervisor/conf.d/supervisord.conf
 
 # Set directory permissions
-RUN chown -R www-data:www-data /var/www/storage /var/www/bootstrap/cache \
+RUN mkdir -p /run/nginx /var/lib/nginx \
+    && chown -R www-data:www-data /var/www \
+    && chown -R www-data:www-data /var/lib/nginx \
+    && chown -R www-data:www-data /run/nginx \
     && chmod -R 775 /var/www/storage /var/www/bootstrap/cache
 
-# Build frontend assets
-RUN curl -fsSL https://deb.nodesource.com/setup_20.x | bash - \
-    && apt-get install -y nodejs \
-    && npm install \
-    && npm run build \
-    && apt-get remove -y nodejs \
-    && apt-get autoremove -y
-
 EXPOSE 80
 
 # Configure entrypoint