Setup GitHub Actions

Author: Andarist

.github/actions/ci-setup/action.yml

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+name: 'CI setup'
+runs:
+  using: 'composite'
+  steps:
+    - name: Use Node.js 20.x
+      uses: actions/setup-node@v3
+      with:
+        node-version: 20.x
+
+    - name: Install Dependencies
+      run: npm install
+      shell: bash

.github/workflows/ci.yml

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+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    timeout-minutes: 20
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: ./.github/actions/ci-setup
+
+      - name: Test
+        run: npm run test