add initial Dockerfile

Dockerfile

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+FROM docker.io/composer:latest AS composer
+
+COPY composer.json composer.lock ./
+
+RUN composer install
+
+
+
+FROM docker.io/php:apache
+
+# copy apache configs
+RUN rm /etc/apache2/sites-enabled/* \
+ && a2enmod rewrite
+COPY docker/ports.conf /etc/apache2/ports.conf
+COPY docker/site.conf /etc/apache2/sites-enabled/site.conf
+
+# copy source files
+COPY --from=composer /app/vendor ./vendor
+COPY src ./src
+
+USER nobody:nogroup

docker/ports.conf

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+# if you change the port here, also change it in site.conf
+Listen 9367

docker/site.conf

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+# if you change the port here, also change it in ports.conf
+<VirtualHost *:9367>
+    DocumentRoot /var/www/html/
+
+    # add a rewrite for /metrics
+    RewriteEngine On
+    RewriteRule "^/metrics$" "/var/www/html/src/metrics.php"
+</VirtualHost>