fix: routerBasename setting (#4891)

.docker/Viewer-v3.x/default.conf.template

@@ -7,7 +7,7 @@ server {
   location / {
     root   /usr/share/nginx/html;
     index  index.html index.htm;
-    try_files $uri $uri/ /index.html;
+    try_files $uri $uri/ ${PUBLIC_URL}index.html;
     add_header Cross-Origin-Resource-Policy same-origin;
     proxy_set_header Host $host;
     proxy_set_header X-Real-IP $remote_addr;

.docker/Viewer-v3.x/entrypoint.sh

@@ -2,12 +2,11 @@
 
 if [ -n "$SSL_PORT" ]
   then
-    envsubst '${SSL_PORT}:${PORT}' < /usr/src/default.ssl.conf.template > /etc/nginx/conf.d/default.conf
+    envsubst '${SSL_PORT}:${PORT}' < /usr/src/default.ssl.conf.template | envsubst '${PUBLIC_URL}' > /etc/nginx/conf.d/default.conf
   else
-    envsubst '${PORT}' < /usr/src/default.conf.template > /etc/nginx/conf.d/default.conf
+    envsubst '${PORT}:${PUBLIC_URL}' < /usr/src/default.conf.template  > /etc/nginx/conf.d/default.conf
 fi
 
-
 if [ -n "$APP_CONFIG" ]; then
   echo "$APP_CONFIG" > /usr/share/nginx/html${PUBLIC_URL}app-config.js
   echo "Using custom APP_CONFIG environment variable"