fix(docker): implement retry logic for package installation and optimize image usage in docker-compose

Dockerfile

@@ -33,10 +33,15 @@ FROM php:8.2-fpm-alpine AS runtime
 
 # System deps + PHP extensions.
 #   pdo_mysql -> MariaDB,  intl -> Symfony,  opcache -> perf,  redis -> Messenger/cache transport
-RUN apk add --no-cache nginx supervisor icu-libs \
- && apk add --no-cache --virtual .build-deps $PHPIZE_DEPS icu-dev \
+# apk/pecl fetch over the network; on busy build hosts the mirror occasionally
+# drops a connection. retry() wraps each network step so a transient failure
+# doesn't abort the whole deploy.
+RUN set -eu; \
+    retry() { for i in 1 2 3 4 5; do "$@" && return 0; echo "retry $i: $*"; sleep 5; done; return 1; }; \
+    retry apk add --no-cache nginx supervisor icu-libs \
+ && retry apk add --no-cache --virtual .build-deps $PHPIZE_DEPS icu-dev \
  && docker-php-ext-install pdo_mysql intl opcache \
- && pecl install redis \
+ && retry pecl install redis \
  && docker-php-ext-enable redis \
  && apk del .build-deps