Improve devcontainer setup

[medihack]

Improves the devcontainer setup by using a docker-compose file to spin up the database.
Maybe we can, at some point, combine both our docker-compose.yml files (maybe even the Dockerfile).

Successful PR Checklist:

• Tests
  • (not applicable?)
• Documentation
  • (not applicable?)

PR label(s):

• PR type: breaking 💥 Contains breaking changes
• PR type: feature ⭐️ Contains new features
• PR type: bugfix 🕵️ Contains bug fix
• PR type: miscellaneous 👾 Contains misc changes
• PR type: dependencies 🤖 Contains only dependencies updates
• PR type: documentation 📚 Contains documentation updates

[github-actions]

Coverage report

This PR does not seem to contain any modification to coverable code.

[medihack]

I wonder a bit why they mount the parent directory of the project in the template, but I kept it that way.

[ewjoachim]

Awesome!

Wonder if it works with github.dev too.

[medihack]

Awesome!

Wonder if it works with github.dev too.

Hm, I tested it only locally and unfortunately there is an import error when I try to run the tests in Github Codespaces. I mark the PR as a draft and figure it out (why can't things just work sometimes out on their own ;-))

[medihack]

Ah, ignore my last message. Everything works fine in Github Codespaces, too. Just tried out the wrong branch 🙄. So, yes it works as expected.

[ewjoachim]

Wow so that means you can get on the repo, hit ., write code, run tests and bam you've got a PR ? That's the future.

[medihack]

Wow so that means you can get on the repo, hit ., write code, run tests and bam you've got a PR ? That's the future.

Not quite. The "." (github.dev) is a completely free in-browser editor only. You can still change code, commit and push, but you can't run a devcontainer or a terminal in it.
Codespaces (which can be started via the "Code" button and there "Codespaces" tab) is a full Cloud IDE that runs on Azure. It supports a dev container and terminals. But you only get 120 CPU hours per month for free (180 as a Github Pro user), after that you have to pay hourly.