updated files for a prod env

frontend/Dockerfile.prod

@@ -0,0 +1,24 @@
+FROM dunglas/frankenphp:latest
+
+COPY --from=composer:2 /usr/bin/composer /usr/bin/composer
+
+ADD --chmod=0755 https://github.com/mlocati/docker-php-extension-installer/releases/latest/download/install-php-extensions /usr/local/bin/
+RUN install-php-extensions pdo_pgsql zip
+
+# The imported event data and the site's audience are both German-local;
+# default to that instead of UTC so any "now"/"today" computation doesn't
+# quietly disagree with the data for the two hours after every UTC midnight.
+ENV TZ=Europe/Berlin
+RUN echo "date.timezone = Europe/Berlin" > $PHP_INI_DIR/conf.d/timezone.ini
+
+WORKDIR /app
+COPY . .
+RUN composer install --no-interaction --no-dev --optimize-autoloader \
+    && php bin/console cache:clear --env=prod --no-debug
+
+# Caddy's default site address in the base image's Caddyfile is
+# {$SERVER_NAME:localhost}; a bare ":8000" (no hostname) makes it listen
+# HTTP-only on that port, which is what we want — Traefik terminates TLS
+# and forwards plain HTTP to this container.
+ENV SERVER_NAME=:8000
+EXPOSE 8000