WIP: fix-TF-env-var-access

Terraform can't access the env variables with the current state of repo. It throws an error during terraform init. To fix it we need to do two things:

  1. Use TF_VAR_name format in app-cred-ohpc_creds-openrc.sh file as described here
  2. Replace the ${TF_var-name } with just {} in the provider.tf file.

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