Procfile

@@ -1 +1 @@
-web: vendor/bin/heroku-php-nginx public/
+web: vendor/bin/heroku-php-nginx -C nginx.conf public/

nginx.conf

@@ -0,0 +1,10 @@
+if ($http_x_forwarded_proto != 'https') {
+    rewrite ^ https://$host$request_uri? permanent;
+}
+
+location / {
+    try_files $uri @rewriteapp;
+}
+location @rewriteapp {
+    rewrite ^(.*)$ /index.php$1 last;
+}