hugo, allow specifying the baseURL since it's helpful for SEO and other things, also rename PORT variables to not collide with Ansible's PROD_PORT.

Config/HugoExample/docker-compose.example.yml

@@ -9,13 +9,14 @@ services:
     image: hyperling/hugo:$BRANCH
     restart: always
     ports:
-      - $PROD_PORT:80  # Production minified files served using NGINX.
-      #- $DEV_PORT:1380 # Development files with drafts served by Hugo Server.
+      - $NGINX_PORT:80  # Production minified files served using NGINX.
+      #- $HUGO_PORT:1380 # Development files with drafts served by Hugo Server.
     environment:
       - REPO=$REPO
       - BRANCH=$BRANCH
-      - PROD=$PROD
-      - DEV=$DEV
+      - PROD=$NGINX
+      - DEV=$HUGO
+      - BASEURL=$BASEURL
     healthcheck:
       test: curl -sS http://localhost:80 || curl -sS http://localhost:1380 || exit 1
       interval: 1m