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If you have a Terraform module in another private git repository, you need to tell Terraform which SSH key it should use. Here’s how to do so - To resolve that issue, you need to pass the SSH key as an environment variable - this environment variable can and should be marked as sensitive. In this case, we call it SSH_PRIVATE_KEY, with minor adjustments Usually, SSH keys look like this - 
-----
Somehexcode
Anotherhexhere
Yetanotherone
---
When you paste it as an env zero variable, replace new lines with ; 
-----Somehexcode;Anotherhexhere;Yetanotherone---
Then we can use Custom Flow to write it to a file 
deploy:
  steps:
    terraformInit:
      before:
        - mkdir -p ~/.ssh
        - echo "$SSH_PRIVATE_KEY" | tr ';' '\n' | tr -d "\r" > ~/.ssh/private_tf_modules
        - chmod 400 ~/.ssh/private_tf_modules
        - echo -e "Host github.com\n User git\n Hostname github.com\n IdentityFile ~/.ssh/private_tf_modules\n StrictHostKeyChecking no" > ~/.ssh/config
        - echo "Created private key"
Then, we tell Linux when we want to SSH to github.com to use this SSH file. We can use different Host configurations for different servers.