Add mirroring

.gitlab-ci.yml

+stages:
+  - publish
+
+mirror:
+  stage: publish
+  script:
+    - setsid ./ci/mirror.sh
+  only:
+    - /^(main.*)$/
+  tags:
+    - mirror

ci/mirror.sh

+#!/bin/bash
+
+REPO_PATH="${PROJECT_HOME}/clean-k8s-objects/"
+
+cd "${REPO_PATH}" && git pull origin main || :
+git push github main -f
+git push internal main -f
+git push pgitlab main -f
+git push froggit main -f
+exit 0