Support `<job>_rules` inputs in `validate-plan-destroy` pipeline template

Changelog: added

templates/validate-plan-destroy.yml

@@ -93,6 +93,42 @@ spec:
       default: ''
       type: string
       description: 'Path to a variables files relative to root_dir.'
+    fmt_rules:
+      default:
+        - if: $CI_PIPELINE_SOURCE == "merge_request_event"
+        - if: $CI_OPEN_MERGE_REQUESTS  # Don't add it to a *branch* pipeline if it's already in a merge request pipeline.
+          when: never
+        - if: $CI_COMMIT_BRANCH        # If there's no open merge request, add it to a *branch* pipeline instead.
+      type: array
+      description: 'Defines the `rules` of the `fmt` job.'
+    validate_rules:
+      default:
+        - if: $CI_PIPELINE_SOURCE == "merge_request_event"
+        - if: $CI_OPEN_MERGE_REQUESTS  # Don't add it to a *branch* pipeline if it's already in a merge request pipeline.
+          when: never
+        - if: $CI_COMMIT_BRANCH        # If there's no open merge request, add it to a *branch* pipeline instead.
+      type: array
+      description: 'Defines the `rules` of the `validate` job.'
+    plan_rules:
+      default:
+        - if: $CI_PIPELINE_SOURCE == "merge_request_event"
+        - if: $CI_OPEN_MERGE_REQUESTS  # Don't add it to a *branch* pipeline if it's already in a merge request pipeline.
+          when: never
+        - if: $CI_COMMIT_BRANCH        # If there's no open merge request, add it to a *branch* pipeline instead.
+      type: array
+      description: 'Defines the `rules` of the `plan` job.'
+    destroy_rules:
+      default:
+        - if: '$CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH && "$[[ inputs.auto_destroy ]]" == "true"'
+        - when: manual
+      type: array
+      description: 'Defines the `rules` of the `destroy` job.'
+    delete_state_rules:
+      default:
+        - if: '$CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH'
+        - when: manual
+      type: array
+      description: 'Defines the `rules` of the `delete-state` job.'
 
 ---
 
@@ -109,11 +145,7 @@ include:
       image_digest: $[[ inputs.image_digest ]]
       root_dir: $[[ inputs.root_dir ]]
       needs: []
-      rules:
-        - if: $CI_PIPELINE_SOURCE == "merge_request_event"
-        - if: $CI_OPEN_MERGE_REQUESTS  # Don't add it to a *branch* pipeline if it's already in a merge request pipeline.
-          when: never
-        - if: $CI_COMMIT_BRANCH        # If there's no open merge request, add it to a *branch* pipeline instead.
+      rules: $[[ inputs.fmt_rules ]]
   - local: '/templates/validate.yml'
     inputs:
       as: '$[[ inputs.job_name_prefix ]]validate'
@@ -127,11 +159,7 @@ include:
       root_dir: $[[ inputs.root_dir ]]
       state_name: $[[ inputs.state_name ]]
       var_file: $[[ inputs.var_file ]]
-      rules:
-        - if: $CI_PIPELINE_SOURCE == "merge_request_event"
-        - if: $CI_OPEN_MERGE_REQUESTS  # Don't add it to a *branch* pipeline if it's already in a merge request pipeline.
-          when: never
-        - if: $CI_COMMIT_BRANCH        # If there's no open merge request, add it to a *branch* pipeline instead.
+      rules: $[[ inputs.validate_rules ]]
   - local: '/templates/plan.yml'
     inputs:
       as: '$[[ inputs.job_name_prefix ]]plan'
@@ -148,11 +176,7 @@ include:
       artifacts_access: $[[ inputs.plan_artifacts_access ]]
       destroy: true
       var_file: $[[ inputs.var_file ]]
-      rules:
-        - if: $CI_PIPELINE_SOURCE == "merge_request_event"
-        - if: $CI_OPEN_MERGE_REQUESTS  # Don't add it to a *branch* pipeline if it's already in a merge request pipeline.
-          when: never
-        - if: $CI_COMMIT_BRANCH        # If there's no open merge request, add it to a *branch* pipeline instead.
+      rules: $[[ inputs.plan_rules ]]
   - local: '/templates/destroy.yml'
     inputs:
       as: '$[[ inputs.job_name_prefix ]]destroy'
@@ -169,18 +193,17 @@ include:
       plan_name: $[[ inputs.plan_name ]]
       auto_destroy: $[[ inputs.auto_destroy ]]
       var_file: $[[ inputs.var_file ]]
-      rules:
-        - if: '$CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH && "$[[ inputs.auto_destroy ]]" == "true"'
-        - when: manual
+      rules: $[[ inputs.destroy_rules ]]
   - local: '/templates/delete-state.yml'
     inputs:
       as: '$[[ inputs.job_name_prefix ]]delete-state'
       stage: $[[ inputs.stage_cleanup ]]
       state_name: $[[ inputs.state_name ]]
-      rules:
-        - if: '$CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH'
-        - when: manual
+      rules: $[[ inputs.delete_state_rules ]]
 
-# NOTE: we have to define this `needs` here, because inputs don't support arrays, yet.
+# FIXME: eventually, we'll have a `needs` input on the `delete-state`
+# job template, but the issue is that we cannot default it to something
+# meaningful other than `null` - but `null` is also not yet supported, see
+# https://gitlab.com/gitlab-org/gitlab/-/issues/440468
 $[[ inputs.job_name_prefix ]]delete-state:
   needs: ['$[[ inputs.job_name_prefix ]]destroy']