fix: made env values sensitive so they're masked

[madhuravius]

Proof of function with latest changes:

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In some cases users will use sensitive values in the config thus printing on their print out, we want to validate that this does not reveal those values regardless of circumstance.

[shortcut-integration[bot]]

This pull request has been linked to Shortcut Story #10490: Mark app configuration as sensitive in Terraform.

[madhuravius]

The first change did not work:

[madhuravius]

I then RM'ed the state:

and then tried to do a plan (causing a change)

[jeremiahbowen]

Thank you, @madhuravius!!! Now all our secrets are protected better! Feature request for 0.8. Maybe a way to differentiate secrets, like allowing APTIBLE_DOCKER_IMAGE to show in the diff. I suggest an additional field that you could merge when applying like secret_config or something.