added mattermost

mattermost-db.container

@@ -0,0 +1,21 @@
+[Unit]
+Description=Mattermost Postgres Database
+
+[Container]
+ContainerName=mattermost-db
+Image=gitea.iot.cudanet.org/administrator/quadlets/postgres:15-alpine
+Environment=POSTGRES_USER=mmuser
+Environment=POSTGRES_PASSWORD=mmuser_password
+Environment=POSTGRES_DB=mattermost
+Volume=/var/podman/mattermost/db:/var/lib/postgresql/data:Z
+Network=mattermost.network
+# This helps with SELinux/Permissions on some RPi distros
+SecurityLabelDisable=true
+
+[Service]
+Restart=always
+# Slow down the restart loop so it doesn't hit the throttle as fast
+RestartSec=5s
+
+[Install]
+WantedBy=multi-user.target