Add guide for configuring terraform backend with managed scaleway solution (S3, DBaaS)

[remyleone]

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Description

I would like to have a guide that explains how to migrate a new state or an existing state to a managed backend such as Database as a service or an S3.

References

• https://www.terraform.io/docs/backends/types/pg.html
• https://www.terraform.io/docs/backends/types/s3.html

[dirsigler]

In my opinion this is not a specific Scaleway "problem", but it still can be some kind of nice to have documentation to improve the experience of engineers starting things out and scaling their projects with Scaleways infrastructure.

Do you still need any help in this direction @remyleone ? If yes, I would love to help you (and other engineers) out and maybe prepare some kind of example "growth" of a project. Concluding some instructions on how you transfer a local Terraform state into a S3 or PG compatible Scaleway solution.