Add tests for dev containers

[StevenMaude]

No description provided.

[lucyb]

It would be worth considering moving this into the research-template-docker repo to avoid too much cruft in this repo. We'll want to add things like alerts into slack, which will add extra things that we probably don't want/need here. We already have a very basic test of the dev container docker image there, so this builds on that work.

It looks like the checkout action supports pulling in other repos, so I think it should work.

- name: Checkout tools repo
  uses: actions/checkout@v4
  with:
    repository: opensafely/research-template

[lucyb]

It's looking like building against macos is a bit more complicated than expected. For now, I would focus on getting it working against ubuntu:latest, which is presumably what GitHub use for Codespaces.

Apologies if you've already thought about this, but I wanted to respond while I had some spare time.

[StevenMaude]

For now, I would focus on getting it working against ubuntu:latest, which is presumably what GitHub use for Codespaces.

I'd already dropped macOS as an idea.

Essentially:

• for Ubuntu, the testing worked first time
• for macOS, Docker is not provided by default, and requires some setup; this should be possible, but is a little tricky to get right (there are third-party actions that do this, but I was trying to include a minimal set of configuration that works)
• for Windows, Docker is pre-installed, there are issues around getting Buildx for Docker installed, which is required for Docker Buildkit; it might work at some point in the future

It would be worth considering moving this into the research-template-docker repo to avoid too much cruft in this repo.

That's fine; I'll do that 😎