remove incorrect os.chdir, handle relative extends/includes

[notdian]

Running docker-compose -f containers/base resulted in a FileNotFoundError. However, it worked after cd containers and then running docker-compose -f base. It appears that the removal of chdir operation was overlooked.

[notdian]

Seems like this broke integration tests, maybe the fix should be to make all files absolute before the loop?

[p12tic]

Seems like this broke integration tests, maybe the fix should be to make all files absolute before the loop?

Probably. This needs checking.

[notdian]

@p12tic looks like the issue was with handling of relative imports, used absolute paths for services and includes, tests are passing now

[p12tic]

Looks good in principle, thanks!

Several small issues:

• Could the PR be split into separate commits for each individual piece (includes, services, chdir fix)?
• PR needs release note in the newsfragments directory (you can look here for inspiration on how release note looks like).

[notdian]

the chdir and services/includes are related, you can't have one without the other, if you think otherwise, I can split them.

[p12tic]

the chdir and services/includes are related, you can't have one without the other, if you think otherwise, I can split them.

You're right, my head is not working.

[cfunkhouser]

I have confirmed that this fixes #1109 for my use cases.

[notdian]

@p12tic can we release this?

[p12tic]

Rebased.