ci: migrate to github actions

.github/workflows/ci.yml

@@ -0,0 +1,83 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    # filtering branches here prevents duplicate builds from pull_request and push
+    branches:
+      - main
+  schedule:
+    - cron: '0 3 * * 0' # every Sunday at 3am
+
+env:
+  CI: true
+
+jobs:
+  tests:
+    if: "! contains(toJSON(github.event.commits.*.message), '[skip ci]')"
+    name: Base Tests
+    timeout-minutes: 5
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node:
+          - '12'
+          - '14'
+    steps:
+      - uses: actions/checkout@v2
+      - uses: volta-cli/action@v1
+        with:
+          node-version: ${{ matrix.node }}
+
+      - run: npm ci
+
+      - name: Test with ${{ matrix.node }}
+        run: npm run test:ember
+
+  floating-dependencies:
+    if: "! contains(toJSON(github.event.commits.*.message), '[skip ci]')"
+    name: Floating Dependencies
+    timeout-minutes: 5
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node:
+          - '12'
+          - '14'
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: volta-cli/action@v1
+        with:
+          node-version: ${{ matrix.node }}
+
+      - run: npm install --no-package-lock
+      - name: Test with Node ${{ matrix.node }}
+        run: npm run test:ember
+
+  try-scenarios:
+    if: "! contains(toJSON(github.event.commits.*.message), '[skip ci]')"
+    name: 'Compatibility'
+    timeout-minutes: 5
+    runs-on: ubuntu-latest
+    needs: tests
+
+    strategy:
+      fail-fast: true
+      matrix:
+        ember-try-scenario:
+          - ember-lts-3.16
+          - ember-lts-3.20
+          - ember-release
+          - ember-beta
+          - ember-canary
+          - ember-classic
+    steps:
+      - uses: actions/checkout@v2
+      - uses: volta-cli/action@v1
+        with:
+          node-version: 12.x
+      - name: install dependencies
+        run: npm ci
+      - name: test
+        run: node_modules/.bin/ember try:one ${{ matrix.ember-try-scenario }} --skip-cleanup

.github/workflows/lint.yml

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+name: Lint
+
+on:
+  pull_request:
+  push:
+    # filtering branches here prevents duplicate builds from pull_request and push
+    branches:
+      - master
+
+env:
+  CI: true
+
+jobs:
+  source:
+    if: "! contains(toJSON(github.event.commits.*.message), '[skip ci]')"
+    name: Source
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: volta-cli/action@v1
+
+      - run: npm ci
+
+      - name: ESLint
+        run: npm run lint:js
+
+      - name: Templates
+        run: npm run lint:hbs