Added .gitlab-ci.yml for github mirror.

.gitlab-ci.yml

@@ -0,0 +1,31 @@
+before_script:
+
+  # Ensure prerequisites are installed
+  - 'which ssh-agent || (apk update && apk add openssh-client git)'
+
+  # Launch ssh agent and add our key
+  - eval $(ssh-agent -s)
+  - echo "${SSH_PRIVATE_KEY}" | tr -d '\r' | ssh-add - > /dev/null
+
+  # Ensure known hosts exists and is populated
+  - mkdir ~/.ssh && chmod 700 ~/.ssh
+  - ssh-keyscan -t rsa github.com >> ~/.ssh/known_hosts && chmod 644 ~/.ssh/known_hosts
+
+push_github:
+  type: deploy
+  environment:
+    name: github
+    url: github.com/jmhbnz/raspi-k3s
+  script:
+    # Output git status
+    - git checkout master && git pull && git status
+
+    # Add a new remote for github
+    - git remote add github git@github.com:jmhbnz/raspi-k3s.git || true
+
+    # Push to the new remote
+    - git push github master
+
+  only:
+    refs:
+      - master