Remmina (#155)

* (nits)

* add hardware encoding support for Intel QSV via VAAPI

* automate RENDER_GID env var

* add remmina

* remmina: github CI

.docker/remmina/supervisord.conf

@@ -0,0 +1,12 @@
+
+[program:remmina]
+environment=HOME="/home/%(ENV_USER)s",USER="%(ENV_USER)s",DISPLAY="%(ENV_DISPLAY)s"
+command=/usr/bin/run-remmina.sh
+stopsignal=INT
+autorestart=true
+priority=500
+user=%(ENV_USER)s
+stdout_logfile=/var/log/neko/remmina.log
+stdout_logfile_maxbytes=100MB
+stdout_logfile_backups=10
+redirect_stderr=true