add update procedure for synapse

synapse/README.md

@@ -0,0 +1,31 @@
+## Update
+
+_Make sure to stop the correct container when needed._
+
+1. Backup media
+
+   - `docker exec -it synapse /bin/bash`
+   - `mkdir /backup && cd /backup`
+   - `tar cvzf synapse_backup.tar.gz /data`
+   - `docker cp synapse:/backup/synapse_backup.tar.gz ./backup`
+
+2. Backup database
+
+   - `docker exec -it synapse-postgres /bin/bash`
+   - `psql -U <user> -l`
+   - `pg_dump -U <user> -Fc synapse > synapse.dump`
+   - Apply this (^) for the bridges databases
+   - `docker cp synapse-postgres:/synapse.dump ./backup`
+   - Apply this (^) for the bridges databases
+
+3. Update
+
+   - `docker-compose pull`
+   - `docker-compose up -d`
+
+4. Restore (if needed, usually with bridges)
+
+   - `docker cp ./backup/synapse.dump synapse-postgres:/data`
+   - `docker exec -it synapse-postgres /bin/bash`
+   - `psql -U <user> -c "CREATE DATABASE synapse;"`
+   - `pg_restore -C -U <user> -d synapse /var/lib/postgresql/data/synapse.dump`