pass httpd listen port as environment variable

relates to #44

Dockerfile

@@ -24,10 +24,11 @@ ARG AWSTATS_VERSION=7.9-r0
 
 RUN apk add --no-cache awstats=${AWSTATS_VERSION} tzdata=${TZDATA_VERSION} \
     && touch /etc/awstats/awstats.conf \
-    && chmod g+w /etc/awstats/awstats.conf
+    && chmod g+w /etc/awstats/awstats.conf \
+    && sed 's/^Listen 80/Listen $HTTPD_PORT/' /usr/local/apache2/conf/httpd.conf > /usr/local/apache2/conf/httpd_env.conf
 
 COPY awstats_env.conf /etc/awstats/
-COPY awstats_httpd.conf /usr/local/apache2/conf/
+COPY awstats_httpd_env.conf /usr/local/apache2/conf/
 COPY entrypoint.sh /usr/local/bin/
 
 ENV AWSTATS_CONF_LOGFILE="/var/local/log/access.log"
@@ -36,6 +37,7 @@ ENV AWSTATS_CONF_SITEDOMAIN="my_website"
 ENV AWSTATS_CONF_HOSTALIASES="localhost 127.0.0.1 REGEX[^.*$]"
 ENV AWSTATS_CONF_INCLUDE="."
 ENV AWSTATS_CONF_ALLOWFULLYEARVIEW=2
+ENV HTTPD_PORT="80"
 
 ENTRYPOINT ["entrypoint.sh"]
 CMD ["httpd-foreground"]

awstats_httpd.conf → awstats_httpd_env.conf

@@ -1,4 +1,4 @@
-<VirtualHost *:80>
+<VirtualHost *:$HTTPD_PORT>
     LoadModule cgi_module modules/mod_cgi.so
     LoadModule perl_module /usr/lib/apache2/mod_perl.so
 

entrypoint.sh

@@ -7,5 +7,7 @@ if [ -x /usr/local/bin/autorun.sh ]; then
 fi
 
 envsubst </etc/awstats/awstats_env.conf >/etc/awstats/awstats.conf
+envsubst </usr/local/apache2/conf/awstats_httpd_env.conf >/usr/local/apache2/conf/awstats_httpd.conf
+envsubst </usr/local/apache2/conf/httpd_env.conf >/usr/local/apache2/conf/httpd.conf
 
 exec "$@"