set up CI, likely with many bugs

src/.gitlab-ci.yml

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+image: node:16
+
+workflow:
+  rules:
+    - if: '$CI_COMMIT_BRANCH'
+
+cache:
+  paths:
+    - .yarn
+
+deploy:
+  before_script:
+    - apt update -yq
+    # Set up rsync to dev server
+    - apt install -y rsync
+    - 'which ssh-agent || ( apt install openssh-client -y )'
+    - mkdir -p ~/.ssh
+    - eval $(ssh-agent -s)
+    - '[[ -f /.dockerenv ]] && echo -e "Host *\n\tStrictHostKeyChecking no\n\n" > ~/.ssh/config'
+    - ssh-add <(echo "$RSYNC_PRIVATE_KEY")
+    - echo "$RSYNC_PRIVATE_KEY" > ~/.ssh/id_rsa
+    # Install yarn & make it accessible
+    - curl -o- -L https://yarnpkg.com/install.sh | bash
+    - export PATH="$HOME/.yarn/bin:$HOME/.config/yarn/global/node_modules/.bin:$PATH"
+  script:
+    - yarn install --cache-folder .yarn
+    - rsync -avuz -e 'ssh -i ~/.ssh/id_rsa' public/ $RSYNC_DESTINATION
+  rules:
+    - if: '$CI_COMMIT_BRANCH == "main"'