Set default value in Dockerfile

Author: koudaiii

Dockerfile

@@ -5,6 +5,7 @@ RUN apk add --no-cache --update \
       apache2-utils
 
 ENV SERVER_NAME example.com
+ENV PORT 80
 ENV WORKER_PROCESSES auto
 
 COPY files/run.sh /

files/run.sh

@@ -21,7 +21,7 @@ htpasswd -bBc /etc/nginx/.htpasswd $BASIC_AUTH_USERNAME $BASIC_AUTH_PASSWORD
 sed \
   -e "s/##WORKER_PROCESSES##/$WORKER_PROCESSES/g" \
   -e "s/##SERVER_NAME##/$SERVER_NAME/g" \
-  -e "s/##PORT##/${PORT:-80}/g" \
+  -e "s/##PORT##/$PORT/g" \
   -e "s|##PROXY_PASS##|$PROXY_PASS|g" \
   nginx.conf.tmpl > /etc/nginx/nginx.conf