Mount Steam Runtime in bwrap container

Mount Steam Runtime explicitly in bwrap container. This is necessary
because the installation can exist under one of the blacklisted root
directories (unlikely, but possible). We already ensured this for
Proton, but forgot to do the same for Steam Runtime.

Author: Matoking

CHANGELOG.md

@@ -7,6 +7,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ## [Unreleased]
 ### Fixed
  - Fix Steam installation being prompted twice when using `protontricks-launch`
+ - Fix Steam Runtime not being available in the bwrap container if it was installed under a subdirectory of one of the blacklisted root directories
 
 ## [1.14.0] - 2026-02-22
 ### Added

src/protontricks/data/scripts/bwrap_launcher.sh

@@ -35,7 +35,7 @@ BLACKLISTED_ROOT_DIRS=(
 )
 
 ADDITIONAL_MOUNT_DIRS=(
-    /run/media "$PROTON_PATH" "$WINEPREFIX"
+    /run/media "$PROTON_PATH" "$WINEPREFIX" "$STEAM_RUNTIME_PATH"
 )
 
 mount_dirs=()