Adding a docker db backup script.

diff --git a/docker_db_backup.sh b/docker_db_backup.sh
new file mode 100755 (executable)
index 0000000..5b87b81
--- /dev/null
+++ b/docker_db_backup.sh
@@ -0,0 +1 @@
+docker exec -it lemmy_db_1 pg_dumpall -c -U rrr > dump_`date +%d-%m-%Y"_"%H_%M_%S`.sql