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

Conflicts:
- `.env.production.sample`:
  Upstream deleted it, I decided to keep it.
- `package.json`:
  Upstream updated a dependency textually too close to wavesurfer.js
  which has been deleted from upstream but is kept in glitch-soc for now.

db/migrate/20200627125810_add_thumbnail_columns_to_media_attachments.rb

@@ -0,0 +1,11 @@
+class AddThumbnailColumnsToMediaAttachments < ActiveRecord::Migration[5.2]
+  def up
+    add_attachment :media_attachments, :thumbnail
+    add_column :media_attachments, :thumbnail_remote_url, :string
+  end
+
+  def down
+    remove_attachment :media_attachments, :thumbnail
+    remove_column :media_attachments, :thumbnail_remote_url
+  end
+end

db/migrate/20200628133322_create_account_notes.rb

@@ -0,0 +1,13 @@
+class CreateAccountNotes < ActiveRecord::Migration[5.2]
+  def change
+    create_table :account_notes do |t|
+      t.references :account, foreign_key: { on_delete: :cascade }, index: false
+      t.references :target_account, foreign_key: { to_table: :accounts, on_delete: :cascade }
+      t.text :comment, null: false
+      t.index [:account_id, :target_account_id], unique: true
+
+      t.timestamps
+    end
+  end
+end
+