Merge branch 'main' into glitch-soc/merge-upstream

- `.env.production.sample`:
  Our sample config file is very different from upstream since it is much more
  complete. Upstream added documentation for a few env variables.
  Copied the new variables/documentation from upstream.
- `app/lib/feed_manager.rb`:
  Upstream added a timeline type (hashtags), while glitch-soc already had an
  extra one (direct messages). Not really a conflict but textually close
  changes.
  Ported upstream's changes.
- `app/models/custom_emoji.rb`:
  Upstream upped the custom emoji size limit, while glitch-soc had configurable
  limits.
  Upped the default limits accordingly.
- `streaming/index.js`:
  Upstream reworked how hastags were normalized. Minor conflict due to
  glitch-soc's handling of instance-local posts.
  Ported upstream's changes.

app/services/fan_out_on_write_service.rb

@@ -16,6 +16,7 @@ class FanOutOnWriteService < BaseService
     check_race_condition!
 
     fan_out_to_local_recipients!
+    fan_out_to_public_recipients! if broadcastable?
     fan_out_to_public_streams! if broadcastable?
   end
 
@@ -51,6 +52,10 @@ class FanOutOnWriteService < BaseService
     end
   end
 
+  def fan_out_to_public_recipients!
+    deliver_to_hashtag_followers!
+  end
+
   def fan_out_to_public_streams!
     broadcast_to_hashtag_streams!
     broadcast_to_public_streams!
@@ -85,6 +90,14 @@ class FanOutOnWriteService < BaseService
     end
   end
 
+  def deliver_to_hashtag_followers!
+    TagFollow.where(tag_id: @status.tags.map(&:id)).select(:id, :account_id).reorder(nil).find_in_batches do |follows|
+      FeedInsertWorker.push_bulk(follows) do |follow|
+        [@status.id, follow.account_id, 'tags', { 'update' => update? }]
+      end
+    end
+  end
+
   def deliver_to_lists!
     @account.lists_for_local_distribution.select(:id).reorder(nil).find_in_batches do |lists|
       FeedInsertWorker.push_bulk(lists) do |list|
@@ -108,7 +121,7 @@ class FanOutOnWriteService < BaseService
   end
 
   def broadcast_to_hashtag_streams!
-    @status.tags.pluck(:name).each do |hashtag|
+    @status.tags.map(&:name).each do |hashtag|
       redis.publish("timeline:hashtag:#{hashtag.mb_chars.downcase}", anonymous_payload)
       redis.publish("timeline:hashtag:#{hashtag.mb_chars.downcase}:local", anonymous_payload) if @status.local?
     end