chore: add lint & fmt to ci/cd

.github/workflows/node.js.yml

@@ -0,0 +1,31 @@
+name: Node.js CI
+on:
+  push:
+    branches: ['main']
+  pull_request:
+jobs:
+  build:
+    name: "Fmt, Lint, & Test"
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version:
+          - 20.x
+          - latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v3
+        with:
+          node-version: ${{ matrix.node-version }}
+      - name: "Webi: Install 'shfmt' and 'shellcheck', and update PATH"
+        run: |
+          sh ./_scripts/install-ci-deps
+          echo "${HOME}/.local/bin" >> $GITHUB_PATH
+      - run: shfmt --version
+      - run: shellcheck -V
+      - run: node --version
+      - run: npm run fmt
+      - run: npm ci
+      - run: npm run lint
+      - run: npm run test

_scripts/install-ci-deps

@@ -0,0 +1,9 @@
+#!/bin/sh
+set -e
+set -u
+
+# Install 'shfmt 3.7.x'
+curl -fsS https://webi.sh/shfmt@3.7 | sh
+
+# Install 'shellcheck v0.9.x'
+curl -fsS https://webi.sh/shellcheck@0.9 | sh