[ticket/11877] Create package links and checksums for announcement via script.

PHPBB3-11877
Merge remote-tracking branch 'remotes/bantu/ticket/11877' into develop-olympus

* remotes/bantu/ticket/11877:
  [ticket/11877] Create package links and checksums for announcement via script.
[ticket/11920] Add MariaDB environment to Travis-CI.

PHPBB3-11920
[ticket/11920] Have to use empty root password otherwise db creation fails.

PHPBB3-11920
Merge pull request #1780 from bantu/ticket/11920

[ticket/11920] Add MariaDB environment to Travis-CI.
[ticket/11920] Actually call travis/setup-mariadb.sh.

PHPBB3-11920
[ticket/11920] Manually purge mysql-common.

PHPBB3-11920
[ticket/11920] Print MariaDB version after successful setup.

PHPBB3-11920
Merge pull request #1782 from bantu/ticket/11920

[ticket/11920] Actually call travis/setup-mariadb.sh.