add basic CI

Author: mansona

.github/workflows/ci.yml

@@ -0,0 +1,70 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - lts-v3
+  pull_request: {}
+
+concurrency:
+   group: ci-${{ github.head_ref || github.ref }}
+   cancel-in-progress: true
+
+jobs:
+  test:
+    name: "Tests"
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: pnpm/action-setup@v2
+        with:
+          version: 8
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 18.x
+          cache: pnpm
+      - run: pnpm i --frozen-lockfile
+      - run: pnpm run test
+
+  floating:
+    name: "Floating Dependencies"
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: pnpm/action-setup@v2
+        with:
+          version: 8
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 18.x
+          cache: pnpm
+      - run: pnpm install --no-lockfile
+      - run: pnpm run test:ember
+
+  try-scenarios:
+    name: ${{ matrix.try-scenario }}
+    runs-on: ubuntu-latest
+    needs: 'test'
+
+    strategy:
+      fail-fast: false
+      matrix:
+        try-scenario:
+          - ember-lts-3.28
+          - embroider-safe
+          - embroider-optimized
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: pnpm/action-setup@v2
+        with:
+          version: 8
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 18.x
+          cache: pnpm
+      - run: pnpm i --frozen-lockfile
+      - name: Run Tests
+        run: pnpm ember try:one ${{ matrix.try-scenario }}