feat: initial Nginx templates

conf.d/openlist.conf.template

@@ -0,0 +1,13 @@
+server {
+    listen 443 ssl;
+    include snippets/https.conf;
+
+    server_name openlist.${BASE_DOMAIN};
+
+    include snippets/proxy.conf;
+
+    location / {
+        proxy_pass http://openlist:5244;
+        proxy_redirect off;
+    }
+}