chore: integrate github actions workflow

.github/actions/run-tests/action.yaml

@@ -0,0 +1,12 @@
+name: "Run tests"
+description: "Runs the tests. Requires that the repo is checked out and gcloud credentials are set."
+runs:
+  using: "composite"
+  steps:
+    - name: Install deps
+      run: npm ci
+      shell: bash
+
+    - name: Test
+      run: npm run test
+      shell: bash

.github/workflows/publish.yaml

@@ -0,0 +1,60 @@
+name: Publish to npm
+
+on:
+  workflow_dispatch: {}
+  workflow_call:
+    inputs:
+      version:
+        required: true
+        type: string
+
+env:
+  FORCE_COLOR: 1
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [12.x, 14.x, 15.x, 16.x]
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v3
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: Run tests
+        uses: ./.github/actions/run-tests
+
+  build-publish:
+    if: github.ref == 'refs/heads/master'
+
+    name: Publish
+    runs-on: ubuntu-latest
+    needs: test
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - uses: actions/setup-node@v3
+        with:
+          node-version: '16.x'
+          registry-url: 'https://registry.npmjs.org'
+
+      - name: Install deps
+        run: npm ci
+
+      - name: Build project
+        run: npm run build
+
+      - name: Publish
+        run: npm publish
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}

.github/workflows/test.yaml

@@ -0,0 +1,29 @@
+name: Test
+
+on:
+  pull_request:
+    types: [opened, labeled, synchronize]
+
+env:
+  FORCE_COLOR: 1
+
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [10.x, 12.x, 14.x, 15.x]
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v3
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: Run tests
+        uses: ./.github/actions/run-tests