ci(ngbootstrap): add GitHub Actions for library

Author: Harmeet Singh

.github/workflows/ci.yml

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+name: CI (datagrid)
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+
+      - run: npm ci
+
+      # ---- choose ONE build command ----
+      # Angular CLI:
+      - run: npm run build datagrid
+        if: ${{ hashFiles('angular.json') != '' }}
+
+      # Nx:
+      - run: npx nx build datagrid
+        if: ${{ hashFiles('nx.json') != '' }}
+
+      # Optional:
+      - run: npm run lint --if-present
+      - run: npm run test --if-present

.github/workflows/release.yml

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+name: Release (npm)
+
+on:
+  push:
+    tags: [ 'v*.*.*' ]
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      id-token: write
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          registry-url: 'https://registry.npmjs.org'
+          cache: 'npm'
+      - run: npm ci
+
+      # Angular CLI:
+      - run: npm run build datagrid
+        if: ${{ hashFiles('angular.json') != '' }}
+      # Nx:
+      - run: npx nx build datagrid
+        if: ${{ hashFiles('nx.json') != '' }}
+
+      - name: Publish
+        run: |
+          cd dist/datagrid || cd dist/libs/datagrid
+          npm publish --access public
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}