Use Docker Compose for testing

[AlekSi]

Description

See #695 and https://travis-ci.org/AlekSi/mysql.

When this is merged, https://github.com/go-sql-driver/mysql/wiki/Testing needs to be updated.

Checklist

• Code compiles correctly
• Created tests which fail without the change (if possible)
• All tests passing
• Extended the README / documentation, if necessary
• Added myself / the copyright holder to the AUTHORS file

[julienschmidt]

#696 was merged and there is now a conflict in .travis.yml. Please rebase on current master

[AlekSi]

PTAL. Two tests are failing:

• With MySQL 8.0 due to Add support for sha256_password pluggable authentication #625, which is required by 8.0.4.
• With MySQL 5.5 – that looks like a genuine bug. Hopefully, with this PR it will be easier for one to make a local 5.5 setup and investigate this issue.

[methane]

I love this.
Please don't forget to update Wiki Page after merge.

[AlekSi]

I don't have permissions for this.

[AlekSi]

Poke @julienschmidt

[julienschmidt]

Hi @AlekSi, my plan would be to merge this shortly after the 1.4.0 release, which I hope we will have ready tomorrow.

The wiki write access is currently restricted since many edits weren't exactly improving the content when everyone could edit it. Of course you could post the changes and someone with write access can apply them — or if you and/or the other Percona folks have a long-term interest in contributing to this project, I would also be open to talk about giving push access to the repository (which unfortunately can not be separated from wiki write access). A few more hands certainly wouldn't hurt.

[AlekSi]

Rebased, PTAL.

[julienschmidt]

In general it looks fine to me.
One small problem is, that you started testing with MySQL 5.5, which currently fails and probably requires some check to skip (a part of) the failing test.

[methane]

Don't change default port to 3307

[methane]

I close this because we moved to GitHub Actions.