build(train): Train is released as Learn is, with a key of its own, beside it in the F-Droid repository (ADR 0030, D58)

apps/train/release.dart configures the release tool for Train's APK on
train.halkyon.eu; its release builds sign with its own key when the tool
hands it over. Its F-Droid listing declares NonFreeDep for Polar's SDK and
NonFreeNet; the repository's script copies each app's icon. The key's
certificate is pinned once the key is made.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

tool/release/fdroid/config/antiFeatures.yml

@@ -1,8 +1,12 @@
 # The anti-features the repository's apps declare, as the main F-Droid
 # repository defines them: names, descriptions and icons from fdroiddata
 # (https://gitlab.com/fdroid/fdroiddata, config/antiFeatures.yml and the icons
-# beside it). The two icons are F-Droid's, under the GNU AGPL v3, fdroiddata's
+# beside it). The icons are F-Droid's, under the GNU AGPL v3, fdroiddata's
 # licence. fdroid copies them into the repository's icons.
+NonFreeDep:
+  name: Non-Free Dependencies
+  description: This app depends on other non-free apps
+  icon: ic_antifeature_nonfreedep.png
 NonFreeNet:
   name: Non-Free Network Services
   description: This app promotes or depends entirely on a non-free network service

tool/release/fdroid/config/categories.yml

@@ -1,3 +1,5 @@
 # The categories the repository's apps are listed in.
 Education:
   name: Education
+Sports & Health:
+  name: Sports & Health