fix: Ensure Terraform is installed

Terraform is removed from the latest 24.04 runner image, ensure it's installed explicitly.

code-formatter/action.yml

@@ -5,6 +5,10 @@ inputs:
     description: "Files to ignore"
     required: false
     default: ""
+  terraform-version:
+    description: "Version of Terraform to use for formatting"
+    required: false
+    default: "latest"
 runs:
   using: "composite"
   steps:
@@ -108,6 +112,12 @@ runs:
         fi
       shell: bash
 
+    - name: Setup Terraform
+        uses: hashicorp/[email protected]  # v3.1.2
+        with:
+          terraform_version: "${{ inputs.terraform-version }}"
+          terraform_wrapper: false
+
     - name: Get PR changed files via Git and code format files
       run: |
         if [[ ${{ steps.branch-exists.outputs.result }} == 0 ]];