Support docker for GitHub Actions

[frezbo]

This is mostly some hacks I did to get docker dependency update support for github-actions. Due to the way the current code is organized it seems harder to use the existing docker package_manager. Are we going to support some kind of sub-dependecy for github-actions type?

Fix #5541

DO NOT MERGE

[frezbo]

I did a code cleanup in the second commit, if it's the right direction, I can now think of fixing/adding specs and also update the file_updater for docker package in github_actions. It;s just a silly code now.

[channelbeta]

Hi @frezbo , I'd love to see this code merged. Do you know if there is any open issue open about it as well?

[jeffwidman]

👋 Thanks, and sorry for the horribly slow reply from the team. We're just now starting to catchup on some of the backlog that we couldn't get to while transitioning to GitHub's infra.

I appreciate the PR, but new ecosystem support is on pause for now (and has been for a while). Once we're ready to accept new ecosystems, then we'll be ready to have more discussions on this. We've also explored the idea of making Dependabot pluggable to support community contributions, but a number of bits are still unclear, so no idea if / when that might ship.

[ssbarnea]

@jeffwidman there is one aspect here: github actions are as internal to github as they can be, so adding support for github own stuff,.... should maybe be a priority? Maybe it was not before the acquisition, but now?

[oradwell]

@abdulapopoola @JamieMagee any update on this now that new ecosystems are accepted again as of #8844?