ci: drift-detection and docs with terraform-docs

.drone.yml

@@ -4,11 +4,9 @@ type: kubernetes
 name: Terraform root module
 
 trigger:
-  event:
-  - cron
-  - push
-  branch:
-  - main
+  ref:
+    - refs/heads/main
+    - refs/pull/*/head
 
 environment:
   TF_IN_AUTOMATION: "1"
@@ -34,7 +32,7 @@ steps:
 - name: terraform plan
   image: hashicorp/terraform:1.1.8
   commands:
-  - terraform plan -out .tfplan
+  - terraform plan $([[ $${DRONE_BUILD_EVENT} = cron ]] && echo "-detailed-exit-code") -out .tfplan
   environment:
     AWS_ACCESS_KEY_ID:
       from_secret: terraform-aws-key-id
@@ -65,6 +63,28 @@ steps:
     KUBE_TOKEN:
       from_secret: lawndale-k8s-ci-token
 
+---
+kind: pipeline
+type: kubernetes
+name: Check docs and format
+
+environment:
+  TF_IN_AUTOMATION: "1"
+
+trigger:
+  ref:
+    - refs/pull/*/head
+
+steps:
+- name: format and generate docs
+  image: hashicorp/terraform:1.1.8
+  commands:
+    - apk add bash wget 
+    - wget -q https://github.com/terraform-docs/terraform-docs/releases/download/v0.16.0/terraform-docs-v0.16.0-linux-amd64.tar.gz -O - | tar -xz terraform-docs -C /usr/local/bin
+    - terraform fmt
+    - terraform-docs .
+    - git diff --exit-code
+
 ---
 kind: signature
 hmac: 6950738d3bbe37bb7d5201b9fd7a086ee09a2206a433f19d01c2570cc5718b61