add healthcheck

Dockerfile

@@ -36,6 +36,12 @@ COPY --from=composer /build/public /var/www/html
 # |--------------------------------------------------------------------------
 RUN a2enmod headers rewrite
 
+# |--------------------------------------------------------------------------
+# | enable metrics
+# |--------------------------------------------------------------------------
+RUN apt update && apt install curl
+HEALTHCHECK CMD curl --fail http://localhost || exit 1  
+
 # |--------------------------------------------------------------------------
 # | expose http port
 # |--------------------------------------------------------------------------