Use log directory that we will be able to write to

[MadLittleMods]

Use log directory that we will be able to write to.

Fix #1644

Pull Request Checklist

• I have added any new tests that need to pass to sytest-whitelist as specified in docs/sytest.md
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[kegsay]

Thanks for this! We use this path in numerous other places though, I think I need @neilalexander to help on which need to be changed (the ones for docker are probably fine staying as /var/log:

/cmd/generate-config/main.go:103:				"path": "/var/log/dendrite",
/build/docker/config/dendrite-config.yaml:344:    path: /var/log/dendrite

[neilalexander]

... which makes me realise that we should probably update the Docker Compose sample files to map the media and log directories somewhere outside of the container.

[MadLittleMods]

@kegsay It looks like both of those places are related to the Docker images. generate-config is only used in Docker and isn't documented elsewhere. And the other instance /build/docker/config/dendrite-config.yaml is self-explanatory as Docker.

Anything else stopping this from merging? Seems like we want to iterate a bit on the Docker setup but we can handle in another PR.

[kegsay]

Agreed.

[MadLittleMods]

Thanks for the review @kegsay 🦫