[SERF-1846] Mark secrets as sensitive by default

[terranisu]

Description

Terraform 0.14 is more strict when it comes to sensitivity-awareness of the input and output variables passed to/from the modules.

The PR marks the secret outputs as sensitive by default. These outputs are already marked as sensitive in many of our modules and cause Terraform 0.14 plans fail with the following error if the secrets are not marked as sensitive across all the module stack:

Error: Output refers to sensitive values

  on .terraform/modules/app.secrets/outputs.tf line 1:
   1: output "all" {

Expressions used in outputs can only refer to sensitive values if the sensitive attribute is true.

Testing considerations

The change has been tested in the internal Terraform 0.14 CI/CD pipelines.

Checklist

• Prefixed the PR title with the JIRA ticket code
• Performed simple, atomic commits with good commit messages
• Verified that the commit history is linear and commits are squashed as necessary
• Thoroughly tested the changes in development and/or staging
• Updated the README.md as necessary

Related links

• SERF-1846

[Neurostep]

LGTM 🚀

[fotos]

👍 LGTM ㊙️