Fixed to have HTTPS working properly, thanks to @anojht on GitHub!

templates/InvoiceNinja-TraefikFix/0/Resources/nginx.conf

@@ -0,0 +1,51 @@
+user www-data;
+
+events {
+  worker_connections 768;
+}
+
+http {
+    upstream backend {
+        server app:9000;
+    }
+    include /etc/nginx/mime.types;
+    default_type application/octet-stream;
+    gzip on;
+    gzip_disable "msie6";
+
+    server {
+        listen      80 default;
+        server_name _;
+
+        root /var/www/app/public;
+
+        index index.php;
+
+        charset utf-8;
+
+        location / {
+            try_files $uri $uri/ /index.php?$query_string;
+        }
+
+        location = /favicon.ico { access_log off; log_not_found off; }
+        location = /robots.txt  { access_log off; log_not_found off; }
+
+        sendfile off;
+
+        location ~ \.php$ {
+            fastcgi_split_path_info ^(.+\.php)(/.+)$;
+            fastcgi_pass backend;
+            fastcgi_index index.php;
+            include fastcgi_params;
+            fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
+            fastcgi_intercept_errors off;
+            fastcgi_buffer_size 16k;
+            fastcgi_buffers 4 16k;
+            fastcgi_param HTTPS 1;
+        }
+
+        location ~ /\.ht {
+            deny all;
+        }
+    }
+}