Adding triage bot

.gitlab-ci.yml

+stages:
+  - triage
+
+dry-run:triage:
+  image: ruby:2.7
+  stage: triage
+  script:
+    - gem install gitlab-triage
+    - gitlab-triage --help
+    - gitlab-triage --dry-run --token $TRIAGE_TOKEN --source projects --source-id $CI_PROJECT_PATH
+  rules:
+    - if: '$CI_COMMIT_BRANCH == $CI_DEFAULT_BRANCH'
+      changes:
+        - .triage-policies.yml
+      when: manual
+    - if: $CI_PIPELINE_SOURCE == "schedule"
+      when: never
+
+run:triage:triage:
+  image: ruby:2.7
+  stage: triage
+  script:
+    - gem install gitlab-triage
+    - gitlab-triage --token $TRIAGE_TOKEN --source-id $CI_PROJECT_PATH
+  rules:
+    - if: $CI_PIPELINE_SOURCE == "schedule"

.triage-policies.yml

+resource_rules:
+    issues:
+      rules:
+        - name: Close due to inactivity
+          conditions:
+            date:
+              attribute: updated_at
+              condition: older_than
+              interval_type: months
+              interval: 6
+            state: opened
+          actions:
+            status:
+              close
+            comment: |
+              This issue has not been updated in 6 months. Closing due to inactivity.