fix: generate gzipped Docker assets at runtime (via #5219)

Dockerfile

@@ -20,8 +20,6 @@ COPY ./dist/* /usr/share/nginx/html/
 COPY ./docker/run.sh /usr/share/nginx/
 COPY ./docker/configurator /usr/share/nginx/configurator
 
-RUN find /usr/share/nginx/html/ -type f -regex ".*\.\(html\|js\|css\)" -exec sh -c "gzip < {} > {}.gz" \;
-
 RUN chmod +x /usr/share/nginx/run.sh
 
 EXPOSE 8080

docker/run.sh

@@ -41,4 +41,6 @@ if [[ -n "${PORT}" ]]; then
     sed -i "s|8080|${PORT}|g" /etc/nginx/nginx.conf
 fi
 
+find $NGINX_ROOT -type f -regex ".*\.\(html\|js\|css\)" -exec sh -c "gzip < {} > {}.gz" \;
+
 exec nginx -g 'daemon off;'