add mysql db in podman backup support

roles/any.tools.backup-scripts/templates/podman-mysql.backup.sh.j2

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+
+podman exec -i {{ item.container }} mysqldump \
+    -u {{ item.mysql_user }} \
+    -p{{ item.mysql_password }} \
+    {{ item.database }} |
+    /usr/bin/gzip --rsyncable |
+    /usr/local/bin/restic backup --stdin --stdin-filename {{ item.name }}.sql.gz