Revert to installing steam as a .deb package

Flatpak seems to complicate Steam's execution of Proton

Dockerfile.debian

@@ -186,6 +186,9 @@ RUN \
 
 # Install X Server requirements
 # TODO: Refine this list of packages to only what is required.
+ENV \
+    XORG_SOCKET_DIR="/tmp/.X11-unix" \
+    XDG_RUNTIME_DIR="/tmp/.X11-unix/run"
 RUN \
     echo "**** Update apt database ****" \
         && apt-get update \
@@ -230,6 +233,9 @@ RUN \
     echo
 
 # Install audio requirements
+ENV \
+    PULSE_SOCKET_DIR="/tmp/pulse" \
+    PULSE_SERVER="unix:/tmp/pulse/pulse-socket"
 RUN \
     echo "**** Update apt database ****" \
         && apt-get update \
@@ -297,7 +303,8 @@ RUN \
     echo
 
 # Add support for flatpaks
-# TODO: Remove bridge-utils 
+ENV \
+    XDG_DATA_DIRS="/home/default/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share:/usr/local/share/:/usr/share/"
 RUN \
     echo "**** Update apt database ****" \
         && apt-get update \
@@ -499,6 +506,25 @@ RUN \
     && \
     echo
 
+# Install Steam
+RUN \
+    echo "**** Update apt database ****" \
+        && apt-get update \
+    && \
+    echo "**** Install Intel media drivers and VAAPI ****" \
+        && apt-get install -y --no-install-recommends \
+            steam \
+    && \
+    echo "**** Section cleanup ****" \
+        && apt-get clean autoclean -y \
+        && apt-get autoremove -y \
+        && rm -rf \
+            /var/lib/apt/lists/* \
+            /var/tmp/* \
+            /tmp/* \
+    && \
+    echo
+
 # Add FS overlay
 COPY overlay /
 
@@ -510,19 +536,10 @@ ENV \
     DISPLAY_SIZEW="1600" \
     DISPLAY_VIDEO_PORT="DFP" \
     DISPLAY=":55"
-ENV \
-    XORG_SOCKET_DIR="/tmp/.X11-unix" \
-    XDG_RUNTIME_DIR="/tmp/.X11-unix/run" \
-    XDG_DATA_DIRS="/home/default/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share:/usr/local/share/:/usr/share/"
 ENV \
     NVIDIA_DRIVER_CAPABILITIES="all" \
     NVIDIA_VISIBLE_DEVICES="all"
 
-# Set pulseaudio environment variables
-ENV \
-    PULSE_SOCKET_DIR="/tmp/pulse" \
-    PULSE_SERVER="unix:/tmp/pulse/pulse-socket"
-
 # Set container configuration environment variables
 ENV \
     MODE="primary" \
@@ -530,12 +547,13 @@ ENV \
     ENABLE_VNC_AUDIO="true" \
     NEKO_PASSWORD=neko \
     NEKO_PASSWORD_ADMIN=admin \
+    ENABLE_STEAM="true" \
+    STEAM_ARGS="-silent" \
     ENABLE_SUNSHINE="false" \
     ENABLE_EVDEV_INPUTS="false"
 
 # Configure required ports
 ENV \
-    PORT_SSH="" \
     PORT_NOVNC_WEB="8083" \
     NEKO_NAT1TO1=""