chore: update tflint job to be compatible with v0.40.0+ config model

No breaking changes. This change preserves old behaviour by creating simple .tflint.hcl file with

plugin "terraform" {
  enabled = true
  preset  = "all"
}

Preset "all" means these rules are enabled, so we can drop this long command with endless `--enable-rule`.

If file already exists, the tflint will use it.

part of https://gitlab.developers.cam.ac.uk/uis/devops/gcp-deploy-boilerplate/-/issues/52

auto-devops/terraform-pipeline.yml

@@ -204,21 +204,18 @@ tflint:
   image:
     name: ghcr.io/terraform-linters/tflint:latest
     entrypoint: [""]
+  before_script: |
+    if [ ! -f .tflint.hcl ]; then
+    cat > .tflint.hcl <<EOL
+    plugin "terraform" {
+      enabled = true
+      preset  = "all"
+    }
+    EOL
+    fi
   script: |
-    tflint --enable-rule terraform_comment_syntax \
-        --enable-rule terraform_deprecated_index \
-        --enable-rule terraform_deprecated_interpolation \
-        --enable-rule terraform_documented_outputs \
-        --enable-rule terraform_documented_variables \
-        --enable-rule terraform_empty_list_equality \
-        --enable-rule terraform_module_pinned_source \
-        --enable-rule terraform_module_version \
-        --enable-rule terraform_naming_convention \
-        --enable-rule terraform_required_providers \
-        --enable-rule terraform_required_version \
-        --enable-rule terraform_typed_variables \
-        --enable-rule terraform_unused_declarations \
-        --enable-rule terraform_unused_required_providers
+    tflint --init
+    tflint --recursive
   rules:
     - if: $TFLINT_DISABLED
       when: never