Add PHP support

Signed-off-by: Emmy D'Anello <emmy@luemy.eu>

Dockerfile

@@ -1,7 +1,10 @@
 FROM python:3-alpine
 
-RUN apk --update add git nginx && \
-    rm /var/cache/apk/*
+ARG PHP_ENABLED
+ENV PHP_ENABLED=${PHP_ENABLED}
+ENV NGINX_SERVER_GIT_URL=""
+
+RUN apk add --no-cache git nginx rsync; if [[ -n "$PHP_ENABLED" ]]; then apk add --no-cache php-fpm php-session php-pdo_mysql; fi
 
 RUN pip install requests --no-cache-dir
 
@@ -10,13 +13,16 @@ RUN mkdir -p /var/www/html
 
 # Configure nginx
 RUN ln -sf /dev/stdout /var/log/nginx/access.log && ln -sf /dev/stderr /var/log/nginx/error.log
-COPY nginx.conf /etc/nginx/http.d/mkdocs-server.conf
-RUN rm /etc/nginx/http.d/default.conf
+COPY nginx*.conf /tmp/
+RUN if [[ -z "$PHP_ENABLED" ]]; then cp /tmp/nginx.conf /etc/nginx/http.d/server.conf; else cp /tmp/nginx-php.conf /etc/nginx/http.d/server-php.conf; fi; rm /etc/nginx/http.d/default.conf
 
 COPY ./entrypoint.sh /hook
 COPY ./docker-hook /hook
 COPY ./update.sh /hook
 
+RUN mkdir /conf
+VOLUME /conf
+
 WORKDIR /var/www/html
 
 ENTRYPOINT ["/hook/entrypoint.sh"]