fix: make the security group description configurable

[syphernl]

what

• Made the security group description configurable

why

• Since v0.35.0 a description will be set which replaces the default "Managed by Terraform". Unfortunately, a change in security group description requires it to be deleted and re-created. This is however not possible when the security group is in active use and result in a state apply failure. This variable can be used to retain the existing "Managed by Terraform" description which doesn't trigger a re-create of the security group.

references

• Add rds security group description #114

[syphernl]

We can either:

• Leave the new description the new default, allowing people to override it and revert it to "Managed by Terraform" to stay compatible with existing setups
• Use "Managed by Terraform" as default description, allowing people to override it to whatever they'd like while remaining compatible with existing setups.

For now I chose the former, since its description is more clear than the "Managed by Terraform". With one variable one can simply override this to retain the current name.

[nitrocode]

/test all

[nitrocode]

/test all