CI: Build GitHub Pages bundle on-the-fly

Builds all the JS and CSS files required for the demo pages in `gh-pages.yml` via GitHub Actions. Removes the necessity of having the JS bundles at `/docs/demos/dist`, as they will be compiled on every commit to `main`.

Please confirm that, under Settings > Pages > Build and deployment (https://github.com/fiduswriter/simple-datatables/settings/pages), the "Source" field is set to "GitHub Actions".

I have checked out `package-lock.json` to make builds deterministic - building the library now or building it in ten months should generate the same code and dependency tree.

.github/workflows/docs.yml

@@ -0,0 +1,53 @@
+name: Update docs
+on:
+    push:
+        branches: ["main"]
+    workflow_dispatch:
+
+# Sets permissions of the GITHUB_TOKEN to allow deployment to GitHub Pages
+permissions:
+    contents: read
+    pages: write
+    id-token: write
+
+# Allow only one concurrent deployment, skipping runs queued between the run in-progress and latest queued.
+# However, do NOT cancel in-progress runs as we want to allow these production deployments to complete.
+concurrency:
+    group: "pages"
+    cancel-in-progress: false
+
+jobs:
+    # Build job
+    build:
+        runs-on: ubuntu-latest
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v3
+            - name: Setup Pages
+              uses: actions/configure-pages@v3
+            - name: Setup Node.js
+              uses: actions/setup-node@v4
+              with:
+                  node-version: 18
+                  cache: 'npm'
+            - name: Build JS bundle
+              run: npm ci
+            - name: Build site
+              uses: actions/jekyll-build-pages@v1
+              with:
+                  source: ./docs
+                  destination: ./_site
+            - name: Upload artifact
+              uses: actions/upload-pages-artifact@v2
+
+    # Deployment job
+    deploy:
+        environment:
+            name: github-pages
+            url: ${{ steps.deployment.outputs.page_url }}
+        runs-on: ubuntu-latest
+        needs: build
+        steps:
+            - name: Deploy to GitHub Pages
+              id: deployment
+              uses: actions/deploy-pages@v2

.github/workflows/lint.yml

@@ -1,17 +1,19 @@
-name: simple-datatables CI
+name: Check lints
 
-on: [push]
+on: [pull_request, push]
 
 jobs:
-  build:
-
+  lint:
     runs-on: ubuntu-latest
-
     steps:
-      - uses: actions/checkout@v3
-      - name: Use Node.js
-        uses: actions/setup-node@v3
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
         with:
           node-version: 18
-      - run: npm install
-      - run: npm run lint
+          cache: 'npm'
+      - name: Install dependencies
+        run: npm ci
+      - name: Lints
+        run: npm run lint

.github/workflows/test.yml

@@ -1,20 +1,23 @@
-name: simple-datatables CI
+name: Check tests
 
-on: [push]
+on: [pull_request, push]
 
 jobs:
-  build:
-
+  test:
     runs-on: ubuntu-latest
-
     steps:
-      - run: sudo apt update && sudo apt install -y google-chrome-stable
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Setup Chrome
+        run: sudo apt update && sudo apt install -y google-chrome-stable
       - run: /usr/bin/google-chrome-stable --version
-      - uses: actions/checkout@v3
-      - name: Use Node.js
-        uses: actions/setup-node@v3
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
         with:
           node-version: 18
-      - run: npm install
+          cache: 'npm'
+      - name: Install dependencies
+        run: npm ci
       - uses: jamesmortensen/chromedriver-matcher-action@v1
-      - run: npm test
+      - name: Tests
+        run: npm test

.gitignore

@@ -1,7 +1,7 @@
 /dist/
+/docs/demos/dist/
 node_modules/
 tests/qunit.css
-package-lock.json
 .DS_Store
 .idea/
 .python-version