ci: run local-lv-kanban e2e tests

GitHub Actions workflow that sets up Elixir + pnpm, installs Playwright
browsers, and runs the local-lv-kanban ExUnit and e2e suites.

Author: mat-hek

.github/workflows/local_lv_kanban_e2e_test.yml

@@ -0,0 +1,114 @@
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+
+name: Local LV Kanban - Build & E2E
+
+on:
+  push:
+    branches: ["**"]
+    paths:
+      - "examples/local-lv-kanban/**"
+      - "local-live-view/**"
+      - ".github/workflows/local_lv_kanban_e2e_test.yml"
+      - "pnpm-workspace.yaml"
+      - "pnpm-lock.yaml"
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+env:
+  CI: true
+  # Use the runner's preinstalled Google Chrome instead of downloading Playwright's
+  # bundled chromium (that download hangs on the runner). Read by playwright.config.js.
+  PW_CHANNEL: chrome
+
+jobs:
+  test:
+    name: Build & test (unit + e2e)
+    runs-on: ubuntu-22.04
+    timeout-minutes: 30
+
+    defaults:
+      run:
+        working-directory: examples/local-lv-kanban
+
+    services:
+      postgres:
+        image: postgres:16
+        env:
+          POSTGRES_USER: postgres
+          POSTGRES_PASSWORD: postgres
+        ports:
+          - 5432:5432
+        options: >-
+          --health-cmd pg_isready
+          --health-interval 10s
+          --health-timeout 5s
+          --health-retries 5
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup toolchain
+        uses: ./.github/actions/setup-toolchain
+
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "24"
+          cache: "pnpm"
+          cache-dependency-path: pnpm-lock.yaml
+
+      - name: Install JS dependencies
+        run: pnpm install
+        working-directory: .
+
+      - name: Restore dependencies cache
+        uses: actions/cache@v4
+        with:
+          path: |
+            examples/local-lv-kanban/deps
+            examples/local-lv-kanban/_build
+          key: ${{ runner.os }}-mix-local_lv_kanban-${{ hashFiles('examples/local-lv-kanban/mix.lock') }}
+          restore-keys: ${{ runner.os }}-mix-local_lv_kanban-
+
+      - name: Install Hex dependencies
+        run: mix deps.get
+
+      # The e2e test starts the Phoenix endpoint in-process (MIX_ENV=test) and serves
+      # prebuilt assets, but esbuild/tailwind are dev-only deps — so build app.js/app.css
+      # up front in :dev. The WASM bundle + AtomVM.* come from `mix llv.build` (run by the
+      # `mix test` alias), and the test DB is created/migrated by that same alias.
+      - name: Build browser assets
+        run: |
+          MIX_ENV=dev mix assets.setup
+          MIX_ENV=dev mix assets.build
+
+      # No Playwright browser-install step: the e2e uses the runner's preinstalled
+      # Google Chrome via PW_CHANNEL=chrome (set above). Downloading Playwright's
+      # bundled chromium hangs on the runner, regardless of version/method.
+      - name: Run tests (unit + e2e)
+        run: mix test
+
+      # On failure, the Playwright HTML report (with traces, screenshots, and
+      # video of each failing test) is the only way to see *why* a test timed
+      # out — the console list output never says which locator it was waiting on.
+      - name: Upload Playwright report
+        if: ${{ !cancelled() }}
+        uses: actions/upload-artifact@v4
+        with:
+          name: playwright-report
+          path: |
+            examples/local-lv-kanban/test/playwright/playwright-report
+            examples/local-lv-kanban/test/playwright/test-results
+          retention-days: 7
+          if-no-files-found: ignore