Update CI config

.github/workflows/ci.yml

@@ -0,0 +1,72 @@
+name: CI
+
+on:
+  push:
+    branches:
+      - master
+      - 'v*'
+  pull_request: {}
+  schedule:
+    - cron:  '0 3 * * *' # daily, at 3am
+
+jobs:
+  test:
+    name: Node 12.x - ubuntu
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: volta-cli/action@v1
+
+      - name: install dependencies
+        run: yarn install --frozen-lockfile
+
+      - run: yarn lint
+      - run: yarn test
+
+  nodeX:
+    name: Node ${{ matrix.node-version }} - ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}-latest
+    timeout-minutes: 10
+
+    needs: [test]
+
+    strategy:
+      matrix:
+        os: [ubuntu, windows]
+        node-version: [10.x, 12.x, 13.x, 14.x]
+
+        # excluded because it is the `test` job above
+        exclude:
+          - os: ubuntu
+            node-version: 12.x
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: volta-cli/action@v1
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: install dependencies
+        run: yarn install --frozen-lockfile --ignore-engines
+
+      - run: yarn test
+
+  floating-dependencies:
+    name: Floating Dependencies
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+
+    needs: [test]
+
+    steps:
+      - uses: actions/checkout@v2
+      - uses: volta-cli/action@v1
+        with:
+          node-version: 12.x
+
+      - name: install dependencies
+        run: yarn install --no-lockfile
+
+      - run: yarn test

.markdownlint.json

@@ -0,0 +1,3 @@
+{
+  "line-length": false
+}

docs/rules/prettier.md

@@ -1,9 +1,9 @@
-## prettier
+# prettier
 
 Runs [Prettier](https://github.com/prettier/prettier) as a rule. If the code matches prettier output, no issue is raised.
 
 It will use the project's local version of Prettier. Note that `prettier` and `ember-template-lint` are required as peerDependencies of the package that bundles this prettier rule.
 
-### Related Rules
+## Related Rules
 
 - [prettier](https://github.com/prettier/eslint-plugin-prettier) from prettier for eslint

package.json

@@ -17,6 +17,8 @@
   "main": "ember-template-lint-plugin-prettier.js",
   "scripts": {
     "changelog": "lerna-changelog",
+    "lint": "npm-run-all lint:* --continue-on-error",
+    "lint:docs": "markdownlint 'docs/**/*.md'",
     "lint:js": "eslint . --cache",
     "test": "mocha --recursive",
     "format": "yarn prettier '**/*.{hbs,js,json,yml}' --write"
@@ -36,13 +38,19 @@
     "eslint-plugin-node": "^11.0.0",
     "eslint-plugin-prettier": "^3.1.0",
     "lerna-changelog": "^1.0.0",
+    "markdownlint-cli": "^0.22.0",
     "mocha": "^7.0.1",
+    "npm-run-all": "^4.1.5",
     "prettier": "^1.19.0"
   },
   "engines": {
     "node": "10.* || >= 12.*"
   },
   "dependencies": {
     "prettier-linter-helpers": "^1.0.0"
+  },
+  "volta": {
+    "node": "12.16.3",
+    "yarn": "1.22.4"
   }
 }