🤖 config(github): Configure workflow to automate build.

These changes were automatically generated by a transform whose code can be found at:
  - https://github.com/make-github-pseudonymous-again/rejuvenate/blob/a44c42967442d65fd14272682fb84a6f32feb841/src/transforms/github:workflow-configure-ci:build.js
Please contact the author of the transform if you believe there was an error.

.github/workflows/ci:build.yml

@@ -0,0 +1,20 @@
+name: ci:build
+on:
+  - push
+  - pull_request
+jobs:
+  test:
+    name: Continuous integration (build)
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout 🛎️
+        uses: actions/checkout@v2
+
+      - name: Install 🔧
+        uses: bahmutov/npm-install@v1
+        with:
+          install-command: yarn --frozen-lockfile --ignore-scripts
+          useRollingCache: true
+
+      - name: Build 🏗️
+        run: yarn ci:build

package.json

@@ -46,6 +46,7 @@
     "build": "NODE_ENV=production microbundle",
     "build-docs": "esdoc",
     "build-gh-pages": "npm run build-docs",
+    "ci:build": "npm run build",
     "ci:test": "npm run lint-config && npm run lint && npm run cover",
     "commit-msg": "commitlint --edit",
     "cover": "NODE_ENV=cover c8 --all --src src --reporter lcov --reporter text-summary --reporter text npm test",