Add GH action: auto review PRs for lint/format problems

- Run workflow on PRs only to avoid duplicated actions
- Combine all checks into one workflow

Issue #2096

Author: robyngit

.github/workflows/format-lint-test.yml

@@ -0,0 +1,52 @@
+name: 'Format, Lint, & Test'
+'on':
+  pull_request:
+    types:
+      - opened
+      - reopened
+      - synchronize
+    branches-ignore:
+      - ignore-*
+jobs:
+  run_checks:
+    name: Run All Checks
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+      - name: Set up Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: '18'
+      - name: Install dependencies
+        run: npm install
+      - name: Check for linting errors on changed code
+        uses: reviewdog/action-eslint@v1
+        if: always()
+        with:
+          github_token: '${{ secrets.GITHUB_TOKEN }}'
+          reporter: github-pr-review
+          eslint_flags: src
+          filter_mode: diff_context
+          fail_on_error: true
+      - name: Check for formatting errors on changed code
+        uses: EPMatt/reviewdog-action-prettier@v1
+        if: always()
+        with:
+          github_token: '${{ secrets.GITHUB_TOKEN }}'
+          reporter: github-pr-review
+          filter_mode: diff_context
+          fail_on_error: true
+      - name: Ensure unit tests pass
+        id: test
+        if: always()
+        run: npm test
+      - name: Ensure docs build without errors
+        id: jsdoc-dry-run
+        if: always()
+        run: npm run jsdoc-dry-run