backup postgres and mattermost to s3

[RafDevX]

Closes #4

[github-actions]

OpenTofu plan for dsekt-infra

Plan: 1 to add, 0 to change, 1 to destroy.

OpenTofu used the selected providers to generate the following execution
plan. Resource actions are indicated with the following symbols:
-/+ destroy and then create replacement

OpenTofu will perform the following actions:

  # module.nixos_install["ares"].module.nixos-rebuild[0].null_resource.nixos-rebuild must be replaced
-/+ resource "null_resource" "nixos-rebuild" {
!~      id       = "*******************" -> (known after apply)
!~      triggers = { # forces replacement
!~          "store_path" = "/nix/store/gvv7d8i6s1r23jmrk3adjdg4k91mgz23-nixos-system-ares-24.05.20240830.6e99f2a" -> "/nix/store/5iknrc2n62yh2c7fkvama1w5dki28vg9-nixos-system-ares-24.05.20240830.6e99f2a"
        }
    }

Plan: 1 to add, 0 to change, 1 to destroy.

📝 Plan generated in Create OpenTofu plan #40

[foodelevator]

After a thorough ocular inspection I have come to the conclusion that this must - without any doubts - work without problems.