fix:Nginx template not replace env correctly (#15651)

docker/nginx/docker-entrypoint.sh

 #!/bin/bash
 
+HTTPS_CONFIG=''
+
 if [ "${NGINX_HTTPS_ENABLED}" = "true" ]; then
     # Check if the certificate and key files for the specified domain exist
     if [ -n "${CERTBOT_DOMAIN}" ] && \
     # Substitute the HTTPS_CONFIG in the default.conf.template with content from https.conf.template
     envsubst '${HTTPS_CONFIG}' < /etc/nginx/conf.d/default.conf.template > /etc/nginx/conf.d/default.conf
 fi
+export HTTPS_CONFIG
 
 if [ "${NGINX_ENABLE_CERTBOT_CHALLENGE}" = "true" ]; then
     ACME_CHALLENGE_LOCATION='location /.well-known/acme-challenge/ { root /var/www/html; }'
 envsubst "$env_vars" < /etc/nginx/nginx.conf.template > /etc/nginx/nginx.conf
 envsubst "$env_vars" < /etc/nginx/proxy.conf.template > /etc/nginx/proxy.conf
 
-envsubst < /etc/nginx/conf.d/default.conf.template > /etc/nginx/conf.d/default.conf
+envsubst "$env_vars" < /etc/nginx/conf.d/default.conf.template > /etc/nginx/conf.d/default.conf
 
 # Start Nginx using the default entrypoint
 exec nginx -g 'daemon off;'