Update MariaDB image to latest Alpine & remove Galera-based images #1866
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This PR is to update the version of MariaDB used in base amazeeio/mariadb images with the latest Alpine release (currently 10.4.12 as at v3.11)
In addition, this PR removes the Galera-based images (mariadb-galera, mariadb-drupal-galera, api-db-galera, keycloak-db-galera) and their associated testing frameworks.
Also, a code example that utilised mariadb-galera has been modified to use mariadb-single and references to Galera in the docs have been removed.
Checklist
Closing issues
Will supersede #892 (which did not remove Galera)
Will address another part of #1324
Will be needed to support Drupal9 #1788
Closes #1666