Add sunshine as an optional background service

overlay/etc/cont-init.d/90-configure_sunshine.sh

@@ -0,0 +1,16 @@
+
+echo "**** Configure Sunshine ****"
+
+if ([ "${MODE}" != "s" ] && [ "${MODE}" != "secondary" ]); then
+    if [ "${ENABLE_SUNSHINE:-}" = "true" ]; then
+        echo "Enable Sunshine server"
+        sed -i 's|^autostart.*=.*$|autostart=true|' /etc/supervisor.d/sunshine.ini
+        chmod +x /usr/bin/start-sunshine.sh
+    else
+        echo "Disable Sunshine server"
+    fi
+else
+    echo "Sunshine server not available when container is run in 'secondary' mode"
+fi
+
+echo "DONE"

overlay/etc/supervisor.d/sunshine.ini

@@ -0,0 +1,20 @@
+
+[program:sunshine]
+priority=50
+autostart=false
+autorestart=true
+# Retry a restart a few times.
+#   The start-sunshine.sh script has a section that will wait for the
+#   X server to become available before executing sunshine. However, this will time out after 30 seconds.
+startretries=10
+user=%(ENV_USER)s
+directory=/home/%(ENV_USER)s
+command=/usr/bin/start-sunshine.sh
+environment=HOME="/home/%(ENV_USER)s",USER="%(ENV_USER)s",DISPLAY="%(ENV_DISPLAY)s",XDG_RUNTIME_DIR="%(ENV_XDG_RUNTIME_DIR)s"
+stopsignal=INT
+stdout_logfile=/home/%(ENV_USER)s/.cache/log/sunshine.log
+stdout_logfile_maxbytes=10MB
+stdout_logfile_backups=7
+stderr_logfile=/home/%(ENV_USER)s/.cache/log/sunshine.err.log
+stderr_logfile_maxbytes=10MB
+stderr_logfile_backups=7