new: [apache] updated version of apache, added http2.

apache/build/Dockerfile

@@ -1,4 +1,7 @@
-FROM docker.0k.io/apache:carif
+## copy of 'php:7.3-apache' image
+## XXXvlab: will need to move towards separate apache and php, so that nginx can
+## replace apache in all conf.
+FROM docker.0k.io/php:7.3-apache
 
 ## Limesurvey
 # RUN apt-get update && \
@@ -15,7 +18,9 @@ FROM docker.0k.io/apache:carif
 #     rm -rf /var/lib/apt/lists/*
 # RUN docker-php-ext-install pgsql pdo_pgsql
 
-RUN a2enmod headers proxy_http rewrite ssl proxy_wstunnel
+
+## XXXvlab: could load these in 'entrypoint.sh' to be more dynamic
+RUN a2enmod headers proxy_http rewrite ssl proxy_wstunnel http2
 
 ## Can remove this when SSL certificate are all valid ones
 RUN apt-get update && apt-get install -y --force-yes ssl-cert