[enh] Add .gitlab-ci

.gitlab-ci.yml

+stages:
+  - build
+  - test
+
+.nvm_env: &nvm_env
+  tags:
+    - redshift
+  before_script:
+    - export NVM_DIR="$HOME/.nvm"
+    - . "$NVM_DIR/nvm.sh"
+
+build:
+  <<: *nvm_env
+  stage: build
+  script:
+    - yarn
+
+test:
+  <<: *nvm_env
+  stage: test
+  script:
+    - yarn test
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