GitHub member environments Plan feature

[ASTRobinson]

A reference to the issue / Description of it

As per ticket #5363 this PR updates the terraform-github.yml workflow to add a 'plan' to the create-github-environments job. This job passes through a dry_run flag which in turn omits the GitHub API submission

How does this PR fix the problem?

This change will ensure that API submissions will only be applied when changes are merged into main

How has this been tested?

I have tested that changes are not submitted to the API when a pull request is raised. Once this PR is merged I will raise a small change to ensure changes are still being applied correctly on merge to main.

Deployment Plan / Instructions

Will this deployment impact the platform and / or services on it?

This PR should have no impact on the platform or services.

Checklist (check x in [ ] of list items)

• [ X ] I have performed a self-review of my own code
• [ X ] All checks have passed
• I have made corresponding changes to the documentation
• Plan and discussed how it should be deployed to PROD (If needed)

Additional comments (if any)

{Please write here}

[github-actions]

TFSEC Scan Success

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TFSEC will check the following folders:

Checkov Scan Success

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Checkov will check the following folders:

CTFLint Scan Success

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Setting default tflint config...
Running tflint --init...
Installing `terraform` plugin...
Installed `terraform` (source: github.com/terraform-linters/tflint-ruleset-terraform, version: 0.2.1)
tflint will check the following folders:

[github-actions]

TFSEC Scan Success

Show Output

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TFSEC will check the following folders:

Checkov Scan Success

Show Output

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Checkov will check the following folders:

CTFLint Scan Success

Show Output

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Setting default tflint config...
Running tflint --init...
Installing `terraform` plugin...
Installed `terraform` (source: github.com/terraform-linters/tflint-ruleset-terraform, version: 0.2.1)
tflint will check the following folders:

[github-actions]

TFSEC Scan Success

Show Output

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TFSEC will check the following folders:

Checkov Scan Success

Show Output

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Checkov will check the following folders:

CTFLint Scan Success

Show Output

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Setting default tflint config...
Running tflint --init...
Installing `terraform` plugin...
Installed `terraform` (source: github.com/terraform-linters/tflint-ruleset-terraform, version: 0.2.1)
tflint will check the following folders:

[github-actions]

TFSEC Scan Success

Show Output

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TFSEC will check the following folders:

Checkov Scan Success

Show Output

*****************************

Checkov will check the following folders:

CTFLint Scan Success

Show Output

*****************************

Setting default tflint config...
Running tflint --init...
Installing `terraform` plugin...
Installed `terraform` (source: github.com/terraform-linters/tflint-ruleset-terraform, version: 0.2.1)
tflint will check the following folders:

[github-actions]

TFSEC Scan Success

Show Output

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TFSEC will check the following folders:

Checkov Scan Success

Show Output

*****************************

Checkov will check the following folders:

CTFLint Scan Success

Show Output

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Setting default tflint config...
Running tflint --init...
Installing `terraform` plugin...
Installed `terraform` (source: github.com/terraform-linters/tflint-ruleset-terraform, version: 0.2.1)
tflint will check the following folders:

[github-actions]

TFSEC Scan Success

Show Output

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TFSEC will check the following folders:

Checkov Scan Success

Show Output

*****************************

Checkov will check the following folders:

CTFLint Scan Success

Show Output

*****************************

Setting default tflint config...
Running tflint --init...
Installing `terraform` plugin...
Installed `terraform` (source: github.com/terraform-linters/tflint-ruleset-terraform, version: 0.2.1)
tflint will check the following folders:

[github-actions]

TFSEC Scan Success

Show Output

*****************************

TFSEC will check the following folders:

Checkov Scan Success

Show Output

*****************************

Checkov will check the following folders:

CTFLint Scan Success

Show Output

*****************************

Setting default tflint config...
Running tflint --init...
Installing `terraform` plugin...
Installed `terraform` (source: github.com/terraform-linters/tflint-ruleset-terraform, version: 0.2.1)
tflint will check the following folders:

[github-actions]

TFSEC Scan Success

Show Output

*****************************

TFSEC will check the following folders:

Checkov Scan Success

Show Output

*****************************

Checkov will check the following folders:

CTFLint Scan Success

Show Output

*****************************

Setting default tflint config...
Running tflint --init...
Installing `terraform` plugin...
Installed `terraform` (source: github.com/terraform-linters/tflint-ruleset-terraform, version: 0.2.1)
tflint will check the following folders:

[SteveLinden]

LGTM