Added trivy

[ep-93]

Adding trivy, following the work done here -

https://github.com/ministryofjustice/modernisation-platform/blob/main/.github/workflows/terraform-static-analysis.yml

and

https://github.com/ministryofjustice/modernisation-platform/blob/main/.github/workflows/code-scanning.yml

[github-actions]

Trivy Scan Success

Show Output

```hcl

---

Trivy will check the following folders:

</details> #### `Checkov Scan` Success
<details><summary>Show Output</summary>

```hcl

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

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: 0.5.0)
tflint will check the following folders:

Trivy Scan Success

Show Output

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

Trivy will check the following folders: