add systemd service file

Signed-off-by: Jeff Carr <jcarr@wit.com>

.debian/files/lib/systemd/system/mattermost.service

@@ -0,0 +1,18 @@
+[Unit]
+Description=Mattermost
+After=network.target
+After=postgresql.service
+BindsTo=postgresql.service
+[Service]
+Type=notify
+ExecStart=/opt/mattermost/bin/mattermost
+TimeoutStartSec=3600
+KillMode=mixed
+Restart=always
+RestartSec=10
+WorkingDirectory=/opt/mattermost
+User=mattermost
+Group=mattermost
+LimitNOFILE=49152
+[Install]
+WantedBy=multi-user.target

.gitignore

@@ -3,4 +3,4 @@
 .debian/data.tar.xz
 .debian/DEBIAN/md5sums
 .debian/files/opt/
-mattermost*
+mattermost*tar.gz