Implement MySQL server ROCK with rockcraft

[jardon]

Issue

The ROCK is created using docker and lacks CI.

Solution

This PR migrates the tooling from docker to rockcraft and adds the supporting CI components for building and publishing. This also addresses privilege dropping for running mysqld as the mysql user.

Context

MySQL Operation
Rockcraft
Github Actions
setpriv manpage

Testing

This is a draft and is untested :)

Release Notes

• Migrate image to rockcraft tooling
• Add github actions CI for building/publishing
• drop root privileges to mysql user

[taurus-forever]

Nice, we need to move branch and change the name.
Let's use "charmed-" for fat OCI/snaps.

[taurus-forever]

The current Dockerfile in branch 8.0-22.04 uses version 0.8.23-1,
however it is a version of package mysql-apt-config while the version of charmed-snap should represent the main payload component version mysql-server which has version 8.0.31-0ubuntu2 I would vote to use it here.

What do you think?

[jardon]

I agree with this. To be clear, do we would want to set the version to 8.0.31-0ubuntu2 or 8.0.31 as thats the actual payload version and the rest of it is packaging info?

[taurus-forever]

BTW, maybe we should also remove Dockerfile as we are going to build and publish ROCK OCI now... to avoid confusion what to edit, etc.

[shayancanonical]

is there any way to version lock these packages? if i understand it correctly, we need the server, router and xtrabackup versions to be aligned for them to work correctly

[jardon]

Not that I have found in any of the documentation or on the forums. I've even played with some of the syntax to see if I could get it to work.

[jardon]

Playing around with this more, I found a way to do it, but I don't believe it is going to be useful as repos don't typically have various versions available of each deb package.