output plan to json file

lib/gitlab/ci/templates/Terraform.gitlab-ci.yml

@@ -35,11 +35,15 @@ validate:
 plan:
   stage: build
   script:
+    - apk update && apk add jq
     - terraform plan -out=$PLAN
+    - "terraform show --json $PLAN | jq '([.resource_changes[].change.actions] | flatten) | {\"create\": (map(select(. == \"create\")) | length),\"update\":(map(select(. == \"update\")) | length),\"delete\": (map(select(. == \"delete\")) | length)}' > tfplan.json"
   artifacts:
     name: plan
     paths:
       - $PLAN
+    reports:
+      terraform: tfplan.json
 
 # Separate apply job for manual launching Terraform as it can be destructive
 # action.