chore(ci): add terraform checks job

.github/workflows/terraform_checks.yml

@@ -0,0 +1,19 @@
+name: Terraform checks and linting
+
+on: [push]
+
+jobs:
+  terraform-lint-format:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Run Terraform Action from oak-terraform-actions
+        uses: oaknational/oak-terraform-actions/actions/terraform-checks@feat/ENG-966-allow-modules
+        with:
+          terraform_base_dir: modules
+        env:
+          TF_WORKSPACE: ci-cd # This is necessary due to the use of Terraform Workspaces and if undefined it will be `default`
+

.tflint.hcl

@@ -0,0 +1,10 @@
+plugin "terraform" {
+  enabled = true
+  preset  = "all"
+}
+
+plugin "google" {
+    enabled = true
+    version = "0.30.0"
+    source  = "github.com/terraform-linters/tflint-ruleset-google"
+}