backup-manager mysql db restore test failure

[rshewitt]

Upgrading the alpine image from 3.14 to 3.20 in the backup-manager app installs mysql-client as MariaDB Ver 15.1 Distrib 10.11.8-MariaDB instead of Ver 14.14 Distrib 5.7.44, for Linux (x86_64). This causes the restore mysql test to fail (failing assertion).

 ✗ mysql backup and restore
   (from function `assert_success' in file test/test_helper/bats-assert/src/assert_success.bash, line 42,
    in test file test/test_mysql.bats, line 31)
     `assert_success' failed
   {
       "Location": "/datastore-backup-test"
   }
   
   -- command failed --
   status : 1
   output (6 lines):
     restoring application-mysql-db (mysql) from /mysql-backup.sql.gz...
     ERROR at line 1: Unknown command '\-'.
     
     real       0m0.640s
     user       0m0.622s
     sys        0m0.093s
   --
   
   delete: s3://datastore-backup-test/mysql-backup.sql.gz
   remove_bucket: datastore-backup-test

Background

• related to #4880
• alpine 3.20 installs 16.x pg client which is compatible with 15.x pg server

How to reproduce

1. Change the alpine version from 3.14 to 3.20 in the app dockerfile
2. run tests

Expected behavior

test pass

Actual behavior

test fail

Links

• MariaDB import issue: Error at line 1: Unknown command '\-' drush-ops/drush#6027
• https://gorannikolovski.com/blog/mariadb-import-issue-error-at-line-1-unknown-command
• https://wiki.alpinelinux.org/wiki/MariaDB#:~:text=The%20Alpine%20Linux%20repositories%20no%20longer%20include%20the%20actual%20MySQL%20binaries%2C%20installing%20the%20mysql%2D*%20packages%20will%20instead%20install%20MariaDB.

[Notes or a checklist reflecting our understanding of the selected approach]