Pull all fallback base images from Harbor, not Docker Hub

Every language's Dockerfile fallback template now pulls from
harbor.192.168.1.7.nip.io/base-images/... (mirrored from Docker Hub via
the new devops-base-images repo) instead of pulling live from Docker
Hub on every build. Eliminates that external dependency at build time,
and lets the mirrored tags be deliberately the leanest official
variant rather than whatever a public tag happens to default to.

- go: unchanged tags (golang:1.22-alpine, alpine:3.20 — already
  minimal), just re-hosted.
- node/python/java: moved from their Debian-slim defaults to the
  -alpine equivalent (node:20-alpine, python:3.12-alpine,
  maven:3-eclipse-temurin-21-alpine, eclipse-temurin:21-jre-alpine).
- php: bigger change — dropped php:*-apache (Debian, full Apache
  httpd) entirely for php:*-cli-alpine + PHP's own built-in dev server
  (`php -S`), moving to port 8080 like every other language instead of
  PHP's special-cased 80. Not production-grade PHP serving (PHP's own
  docs call the built-in server not designed for that), but genuinely
  minimal and fine for a homelab/demo app — would need php-fpm+nginx
  for anything serving real traffic.

Only versions actually mirrored into Harbor resolve now — a
dockerBuildVersion whose tag isn't in devops-base-images/images.txt
needs that added and re-mirrored first, unlike pulling straight from
Docker Hub where any tag "just worked". Chose keeping a shell (Alpine)
over full distroless — homelab kubectl-exec debuggability weighed more
than the last bit of attack-surface reduction.

resources/com/homelab/php-Dockerfile

@@ -1,12 +1,33 @@
 # Fallback only — see go-Dockerfile's header comment for the general
-# rule. Simplified from the real php-Dockerfile. Assumes a standard
-# composer-based repo served by Apache.
-FROM php:${version}-apache
+# rule, including the Harbor base-images sourcing (also applies here).
+# Simplified from the real php-Dockerfile. Assumes a standard
+# composer-based repo.
+#
+# Was php:*-apache (Debian, full Apache httpd) — dropped Apache
+# entirely in favor of php:*-cli-alpine + PHP's own built-in dev server
+# (`php -S`). Genuinely minimal (no httpd, no extra process, Alpine
+# base) and brings this language in line with every other one here on
+# port 8080 instead of PHP's special-cased 80. Trade-off, stated
+# plainly: PHP's own docs call the built-in server "not designed to be
+# a full-featured web server" for production — perfectly fine for a
+# homelab/demo app, would need revisiting (php-fpm + nginx, two
+# processes/containers) for anything serving real production traffic.
+#
+# docker-php-ext-install needs PHPIZE_DEPS present to compile
+# extensions on Alpine (unlike the Debian image, which had them
+# preinstalled) — installed as a virtual package and removed again
+# right after, so the final image doesn't carry build tooling.
+FROM harbor.192.168.1.7.nip.io/base-images/php:${version}-cli-alpine
 WORKDIR /var/www/html
-RUN docker-php-ext-install pdo pdo_mysql
+RUN apk add --no-cache --virtual .build-deps $PHPIZE_DEPS \
+    && docker-php-ext-install pdo pdo_mysql \
+    && apk del .build-deps
 COPY . .
 RUN if [ -f composer.json ]; then \
+      apk add --no-cache --virtual .composer-deps curl && \
       curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer && \
-      composer install --no-dev --optimize-autoloader; \
+      composer install --no-dev --optimize-autoloader && \
+      apk del .composer-deps; \
     fi
-EXPOSE 80
+EXPOSE 8080
+CMD ["php", "-S", "0.0.0.0:8080", "-t", "."]