app_containers: Add default hacks for Proton

Need to disable futex for Proton to avoid dead locks (for some reason).

app_containers/.local/bin/run_app_container

@@ -69,6 +69,9 @@ SUDO_ASKPASS=$HOME/.local/bin/askpass-bemenu sudo -A systemd-nspawn -M $CONTAINE
     --setenv=DBUS_SESSION_BUS_ADDRESS=unix:path=/run/host/bus \
     `# Scaling `\
     --setenv=GDK_SCALE="$GDK_SCALE" \
+    `# Hacks for Proton (enable logging, disable futex-based synchronization)` \
+    --setenv=PROTON_LOG=1 \
+    --setenv=PROTON_NO_FSYNC=1 \
     `# Extra params` \
     $SYSTEMD_NSPAWN_EXTRA_ARGS \
     `# Launch app` \