feat(config): move apache2 configuration from runtime to build time

This commit is the first of a PR that will
aim at dropping requirement to run containers
with root permissions.

This commit leverages PassEnv rather than sed &
dynamic environment substitution in the config files.

Author: thylong

Dockerfile

@@ -38,6 +38,9 @@ RUN apk --no-cache --update \
     && mkdir /htdocs
 
 COPY linkstack /htdocs
+COPY configs/apache2/httpd.conf /etc/apache2/httpd.conf
+COPY configs/apache2/ssl.conf /etc/apache2/conf.d/ssl.conf
+
 RUN chown -R apache:apache /htdocs
 RUN find /htdocs -type d -print0 | xargs -0 chmod 0755
 RUN find /htdocs -type f -print0 | xargs -0 chmod 0644