Create coveralls.yml

.github/workflows/coveralls.yml

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+# This is a basic workflow to help you get started with Actions
+
+name: Coveralls
+
+# Controls when the action will run. 
+on:
+  # Triggers the workflow on push or pull request events but only for the main branch
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  coverage:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+      # Runs a set of commands using the runners shell
+      - name: Install and run
+        run: |
+          npm install -g nyc @litejs/cli
+          nyc -r lcovonly -r text lj test
+      - name: Coveralls
+        uses: coverallsapp/github-action@master
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+