Add support for docker with README install instructions

[Ew4n1011]

This is a push request that I submitted a couple of weeks ago, but then closed due to spotting a bug, which should now be resolved

This push requests adds a Dockerfile to add support for running aurto via a docker container, with included install instructions and a workflow to automatically build a new image every time a push is commited to the master branch and uploades it to the GitHub package registry.

Sidenote: the Dockerfile builds aurto from the AUR, which may make it slightly behind github commits at times.

[alexheretic]

Thanks for raising this! This seems useful, allowing running aurto from another distro.

Some thoughts:

• It may make sense to disable chroot builds in docker, it is already running in a container anyway. This can be configured by touch /usr/lib/aurto/conf-disable-chroot in the docker build. With that present chroot will not be used. This saves space in the container and should make it easier to maintain (we'd need to keep base-devel package).
• The docker image size is fairly large (1.7GB vs archlinux 432MB). This could maybe be reduced by having a 2-stage build (makepkg aurto/aurutils and copy them to final image) & perhaps removing more cache stuff.
• It doesn't make sense to have Europe/Madrid stuff in the build we may as well use default.
• Is gosu necessary? It complicates the build. But 2-phase would end up removing it anyway, so it may not be a big deal either way.
• pacman cache cleanup hooks: I think the default setup will continually grow disk usage in the container, in the way arch default setup does. It may make sense to add a default cleanup hook to prevent this. I don't think the container benefits from storing old packages.

[Ew4n1011]

Thanks for the feedback! I took a look at what you said above on your previous comments and tried to apply them. Most of them are mentioned in their own convos but regarding what you had in the bullet section of your message above:

• gosu was removed since it wasn't needed due to 2-stage build
• Timezone stuff removed since not needed
• Pacman cache cleanup hook added everytime a user installs, updates or removes a package using: paccache -rk0

Also I tried to minimise the image as much as possible by removing cache and whatnot, but the least I could manage was 1.49 GB (maybe you have an idea on how to decrease it further?)

[alexheretic]

That sounds great thanks! I'll re-review a little later when I have more free time.

[AladW]

The docker image size is fairly large (1.7GB vs archlinux 432MB). This could maybe be reduced by having a 2-stage build (makepkg aurto/aurutils and copy them to final image) & perhaps removing more cache stuff.

This might be due to depending on devtools, which pulls in python etc.

[Ew4n1011]

~Ah I see, maybe possible to minimise if it only pulls needed packages instead of all base-devel?~

Just learnt that devtools is actually its own package, so since it needs it, there's no other way to minimise space right?

[AladW]

It doesn't need it if you disable chroot builds

[Ew4n1011]

Ah ok, I did disable it for aurto but guessing it's a different way for aurutils? I'll have a look at that later

[alexheretic]

Ah ok, I did disable it for aurto but guessing it's a different way for aurutils? I'll have a look at that later

devtools is a required dependency of aurto right now, so my bad. We can improve this later

[alexheretic]

Great stuff @Ew4n1011 thank you!