[docker] allow use path prefix

Dockerfile

@@ -2,6 +2,8 @@ ARG NGINX_VERSION=1.27.1
 
 FROM nginx:${NGINX_VERSION}-alpine
 
+ENV LINK_PREFIX=""
+
 COPY css /opt/litterlink/css
 COPY fonts /opt/litterlink/fonts
 COPY images /opt/litterlink/images

templates/default.conf.template

@@ -1,8 +1,8 @@
 server {
 	listen 80;
 
-	location / {
-		root /opt/litterlink;
-		index index.html;
+	location ~ ^$LINK_PREFIX/$ {
+   		root /opt/litterlink/;
+    	try_files /index.html =404;
 	}
 }