Add health check (#24)

Author: roblandry

Dockerfile

@@ -28,6 +28,7 @@ RUN \
     php7.3-xml \
     php7.3-zip \
     php7.3-fpm \
+    curl \
     git \
     composer && \
     cd /var/www/html && \
@@ -54,6 +55,8 @@ RUN chmod +x /entrypoint.sh && \
     chmod +x /inject.sh && \
     mkdir /run/php
 
+HEALTHCHECK CMD curl --fail http://localhost:80/ || exit 1
+
 ENTRYPOINT [ "/entrypoint.sh" ]
 
 CMD [ "nginx" ]