Fix Dockerfile: missing lock files, PHP extensions, and Alpine deps - #1401

docker build fails on a clean clone because both composer.lock and package-lock.json are gitignored, and two required PHP extensions (intl, zip) plus their Alpine build dependencies are absent.

Changes

• Optional composer.lock copy — COPY composer.json composer.lock ./ → COPY composer.json composer.lock* ./ so the build doesn't fail when the lock file isn't present
• npm ci → npm install — npm ci requires package-lock.json; since it's gitignored, switch to npm install
• Missing Alpine packages — add icu-dev and libzip-dev to apk add
• Missing PHP extensions — add intl and zip to docker-php-ext-install

-    libxml2-dev \
+    libxml2-dev \
+    icu-dev \
+    libzip-dev \
     && docker-php-ext-configure gd --with-freetype --with-jpeg \
-    && docker-php-ext-install pdo pdo_mysql mbstring exif pcntl bcmath gd opcache
+    && docker-php-ext-install pdo pdo_mysql mbstring exif pcntl bcmath gd opcache intl zip

-COPY composer.json composer.lock ./
+COPY composer.json composer.lock* ./

-    && npm ci \
+    && npm install \