Add qt-pinned-stremio to CI cache

Stremio uses qt5webengine, so it benefits from the separate
nixpkgs-qt input to avoid rebuild churn.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -51,6 +51,7 @@ jobs:
             custom-beads
             custom-gastown
             qt-pinned-jellyfin-media-player
+            qt-pinned-stremio
             nix-deck-kernel
           )
 

flake.nix

@@ -259,6 +259,7 @@
         "custom-tea-rbw" = pkgs.custom.tea-rbw;
         "custom-rclone-torbox-setup" = pkgs.custom.rclone-torbox-setup;
         "qt-pinned-jellyfin-media-player" = pkgsQt.jellyfin-media-player;
+        "qt-pinned-stremio" = pkgsQt.stremio;
         # Flake input packages (beads, gastown) - these get version from input rev
         "custom-beads" = pkgs.callPackage ./packages/beads {
           src = inputs.beads;