So far we've gotten away with using GCC 11 for Lagom and to compile the
toolchain, but via #15795 we discovered a compiler bug that has been
fixed in the latest version but would error the build with CI's GCC 11.
Time for an upgrade :^)
We already use ubuntu-22.04 images in most places, so this is pretty
straightforward. The only exception is Idan's self-hosted runner, which
uses Ubuntu Focal. LibJS should build fine with GCC 11, still.
The goal of these more recent additions to the Dockerfile is to provide
a working copy of SerenityOS with the toolchain prebuilt. To me, these
additions feel misplaced:
- The toolchain is built assuming the i686 architecture, which may not
be what you want.
- You get a shallow clone of the project limiting you in your abilities
to navigate through the project's history or bisect.
- There's this awkward directory structure of `/serenity/serenity-git`
and `/serenity/out`.
The Dockerfile is immensely useful for building SerenityOS in a
containerized environment, separate from the host's environment. If we
want to automate builds, we can always use CI or extend this image to
do so. For now, let's remove the `git clone` and associated actions.
Fixes#9310.
Docker is a nice way of doing build automation, or just
containerizing builds for increased safety and isolating unstable
packages. The old Dockerfile in the toolchain did not satisfy these
needs. The new Dockerfile is known to run successfully on Docker
version 20.10.7. It clones the SerenityOS repo and builds the
toolchain. In this way, it is intended to be a starting point for other
Docker images that can e.g. run builds. For example, one can simply run
this docker image as-is, exec a shell in it and run a build there.
