Allow many Meilisearch write addrs (#5102)

* Write to many Meilisearch write addrs

* Keep client results ordered

* Attach Read Meilisearch client to actix data

* Load balanced meilisearch Compose profile

* Nginx config (round_robin)

* Fix nginx

* Meilisearch + nginx in same net

* Fix env vars example

* Fix env example again

* Fix env again

* Use try_collect with FuturesOrdered

* maybe fix remove_documents

* Clippy

apps/labrinth/nginx/meili-lb.conf

@@ -0,0 +1,14 @@
+upstream meilisearch_upstream {
+    server meilisearch0:7700;
+    server meilisearch1:7700;
+}
+
+server {
+    listen 80;
+
+    location / {
+        proxy_pass http://meilisearch_upstream;
+        proxy_set_header Host $host;
+        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+    }
+}