fix: Move KMS mode setting into environment in system_files

Author: KyleGospo

Containerfile

@@ -82,8 +82,7 @@ RUN if grep "gnome" <<< "${IMAGE_NAME}"; then \
     rpm-ostree override replace --experimental --from repo=copr:copr.fedorainfracloud.org:kylegospo:gnome-vrr \
         mutter \
         gnome-control-center \
-        gnome-control-center-filesystem && \
-    echo MUTTER_DEBUG_FORCE_KMS_MODE=simple >> /etc/environment \
+        gnome-control-center-filesystem \
 ; fi
 
 # Configure KDE

system_files/desktop/gnome/etc/environment

@@ -0,0 +1,9 @@
+# Required for use of OBS-VkCapture in X11 environments
+# Nvidia users must additionally have nvidia-drm.modeset=1 in their kargs
+OBS_USE_EGL=1
+
+# Required for Decky Loader on systems with SELinux
+DECKY_SELINUX=1
+
+# Required for GNOME VRR MR
+MUTTER_DEBUG_FORCE_KMS_MODE=simple