perf(docker): parallel ext compile (MAKEFLAGS=-j) to beat Coolify build timeout

Coolify builds with --no-cache, so intl (C++) recompiles from source every
deploy (~180s single-threaded) and overran the build timeout (exit 255).
Compile across all cores via MAKEFLAGS=-j$(nproc) to cut it several-fold.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Dockerfile

@@ -54,8 +54,13 @@ FROM php:8.2-fpm-alpine AS runtime
 # built directly from its GitHub source tarball instead (github.com IS
 # reachable). pdo_mysql/intl/opcache are bundled with PHP and need no network.
 # retry() guards the apk/github fetches against transient mirror drops.
+#
+# intl is C++ and slow to compile; Coolify builds with --no-cache so it recompiles
+# every deploy and was overrunning the build timeout (exit 255). Compile in
+# parallel across all cores (MAKEFLAGS=-j$(nproc)) to cut that time several-fold.
 ENV PHPREDIS_VERSION=6.1.0
 RUN set -eu; \
+    export MAKEFLAGS="-j$(nproc)"; \
     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 \