Revert "Remove the need for AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY to be set with Digital Ocean deployment"

[viniciusdc]

Reverts #1344

[viniciusdc]

.c.c @costrouc, qhub destroy fails with:

INFO:qhub.provider.terraform:terraform init directory=stages/02-infrastructure/do
INFO:qhub.provider.terraform: terraform at /tmp/terraform/1.0.5/terraform
[terraform]: Upgrading modules...
[terraform]: - kubernetes in modules/kubernetes
[terraform]: 
[terraform]: Initializing the backend...
[terraform]: ╷
[terraform]: │ Error: error configuring S3 Backend: no valid credential sources for S3 Backend found.
[terraform]: │ 
[terraform]: │ Please see https://www.terraform.io/docs/language/settings/backends/s3.html
[terraform]: │ for more information about providing credentials.
[terraform]: │ 
[terraform]: │ Error: NoCredentialProviders: no valid providers in chain. Deprecated.
[terraform]: │ 	For verbose messaging see aws.Config.CredentialsChainVerboseErrors
[terraform]: │ 
[terraform]: │ 
[terraform]: │ 
[terraform]: ╵
[terraform]: 

[viniciusdc]

This will need to be addressed later on