Create NodeJS Action

Looks like Travis is a bit broken, and I don't have admin access to the repo over there. For now, as I have admin access to this repo here, let's try out GitHub Actions to replace the old CI.

TODO:
- [ ] Re-add the Docker publishing
- [ ] Create the `npm run save-coverage` script

.github/workflows/node.js.yml

@@ -0,0 +1,50 @@
+# This workflow will do a clean install of node dependencies, build the source code and run tests across different versions of node
+# For more information see: https://help.github.com/actions/language-and-framework-guides/using-nodejs-with-github-actions
+
+name: Node.js CI
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  test:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [8.x, 10.x, 12.x, 13.x]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node-version }}
+    - run: npm ci
+    - run: npm run build --if-present
+    - run: npm test
+    - run: npm run save-coverage
+    - name: Report to Coveralls (parallel)
+      uses: coverallsapp/github-action@master
+      env:
+        COVERALLS_FLAG_NAME: run-${{ matrix.test_number }}
+      with:
+        github-token: ${{ secrets.GITHUB_TOKEN }}
+        parallel: true
+
+  finish:
+
+    needs: test
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Report to Coveralls
+      uses: coverallsapp/github-action@master
+      with:
+        github-token: ${{ secrets.GITHUB_TOKEN }}
+        parallel-finished: true
+