fix gitignore and default BIND address in service file

build-deb/flaskapp/lib/systemd/system/flaskapp.service

@@ -0,0 +1,12 @@
+[Unit]
+Description=Gunicorn flaskapp service
+Documentation=man:gunicorn(1)
+After=network.target nss-lookup.target
+
+[Service]
+WorkingDirectory=/var/flaskapp/
+ExecStart=/usr/bin/gunicorn --workers 3 --bind 0.0.0.0:80 run:app
+
+[Install]
+WantedBy=multi-user.target
+