ci: add drone.yml

.drone.yml

@@ -0,0 +1,45 @@
+---
+kind: pipeline
+type: kubernetes
+name: Terraform root module
+
+trigger:
+  event:
+  - cron
+  - push
+  branch:
+  - main
+
+steps:
+- name: pipeline init
+  image: hashicorp/terraform:1.1.8
+  commands:
+    - mkdir -p ~/.ssh
+    - chmod 700 ~/.ssh
+    - "echo $${CI_SSH_KEY} > ~/.ssh/id_rsa"
+    - chmod 600 ~/.ssh/id_rsa"
+    - ssh-keyscan git.thomasklein.me
+  environment:
+    CI_SSH_KEY:
+      from_secret: ci-ssh-key
+
+- name: terraform init
+  image: hashicorp/terraform:1.1.8
+  commands:
+  - terraform init
+
+- name: terraform plan
+  image: hashicorp/terraform:1.1.8
+  commands:
+  - terraform plan -out .tfplan
+
+- name: terraform apply
+  when:
+    when:
+      branch:
+      - main
+      event:
+      - push
+  image: hashicorp/terraform:1.1.8
+  commands:
+    - terraform apply -plan .tfplan -auto-approve