Add Baltic Ruby 2025 event and artwork (#458)

* Add Baltic Ruby 2025 event and artwork

* YAML lint

data/balticruby/balticruby-2025/videos.yml

@@ -0,0 +1,10 @@
+---
+- title: "Keynote by Tim Riley"
+  raw_title: "Keynote by Tim Riley"
+  speakers:
+    - Tim Riley
+  event_name: Baltic Ruby 2025
+  description: "Keynote by Tim Riley"
+  date: "2025-06-12"
+  video_id: tim-riley-baltic-ruby-2025
+  video_provider: scheduled

data/balticruby/playlists.yml

@@ -15,3 +15,20 @@
   featured_background: "#D9FB6E"
   featured_color: "#4738FF"
   website: https://balticruby.org/archive/2024
+
+- id: balticruby-2025
+  title: Baltic Ruby 2025
+  location: "Riga, Latvia"
+  description: Baltic Ruby, Riga, Latvia. Show The Diff. June 12 — 14, 2025.
+  published_at: "2025-06-14"
+  start_date: "2025-06-12"
+  end_date: "2025-06-14"
+  channel_id: UCyTip8pDXBqTxTR6fDZItDw
+  year: "2025"
+  videos_count: 15
+  metadata_parser: Youtube::VideoMetadata
+  slug: balticruby-2025
+  banner_background: "#D9FB6E"
+  featured_background: "#D9FB6E"
+  featured_color: "#4738FF"
+  website: https://balticruby.org