feat(docker-compose): add a way to change default datasource

[riipeckx]

Summary

As I'd like to use PostgreSQL, I added a way to set the default datasource via environment variables.

[klesh]

LGTM, did you test it? did it work?

[riipeckx]

LGTM, did you test it? did it work?

I tested it locally, and it worked well :)

[klesh]

I am afraid this would affect helm chart and release procedure as well. We need more input about this @matrixji @JorgeGar @d4x1 What do you guys think?

[d4x1]

@klesh Yes hel charts should be updated too @riipeckx https://github.com/apache/incubator-devlake-helm-chart/blob/main/charts/devlake/values.yaml

[victormrc-betclic]

I'll check this out asap :)

[riipeckx]

I'm working on helm charts updates in the given repo.

[d4x1]

LGTM. Please consider @klesh 's comments.

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