* **.github/workflows/deploy_tre.yml**
  - Add an input for `DEPLOY_MODE` in the workflow
  - Pass the `DEPLOY_MODE` input to the deployment script

* **docs/tre-admins/setup-instructions/workflows.md**
  - Add instructions on using the `DEPLOY_MODE` variable for 'plan' mode deployments via the GitHub UI

* **devops/scripts/terraform_wrapper.sh**
  - Add a check for the `DEPLOY_MODE` variable
  - Execute `terraform plan` without applying if `DEPLOY_MODE` is set to 'plan'
  - Log the plan output to a file

* **docs/tre-admins/setup-instructions/manual-deployment.md**
  - Add instructions on using the `DEPLOY_MODE` variable for 'plan' mode deployments
  - Include examples of setting the `DEPLOY_MODE` variable to 'plan' and 'apply'

Related to #4029

Add support for 'plan' mode deployments to evaluate the terraform plan before applying it.

* **devops/scripts/terraform_wrapper.sh**
  - Add a check for the `DEPLOY_MODE` variable.
  - Execute `terraform plan` without applying if `DEPLOY_MODE` is set to 'plan'.
  - Log the plan output to a file.

* **docs/tre-admins/setup-instructions/manual-deployment.md**
  - Add instructions on using the `DEPLOY_MODE` variable for 'plan' mode deployments.
  - Include examples of setting the `DEPLOY_MODE` variable to 'plan' and 'apply'.

* **.github/workflows/deploy_tre.yml**
  - Add an input for `DEPLOY_MODE` in the workflow.
  - Pass the `DEPLOY_MODE` input to the deployment script.

* **docs/tre-admins/setup-instructions/workflows.md**
  - Add instructions on using the `DEPLOY_MODE` variable for 'plan' mode deployments via the GitHub UI.
  - Include examples of setting the `DEPLOY_MODE` variable to 'plan' and 'apply'.

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For more details, open the [Copilot Workspace session](https://copilot-workspace.githubnext.com/microsoft/AzureTRE/issues/4029?shareId=XXXX-XXXX-XXXX-XXXX).

…robi/marrobi/issue4029