feat(ci): added github workflow for testing (#464)

this will be run against pull requests on next
and master.

this also updates karma to v6 and utilizes the new
public api so we no longer have to fork a child
process to avoid karma < 6's behavior of calling
process.exit(#)

this also increases the default timeout of the
integration tests as 5 seconds was just too short
for the CI to be able to properly complete.

Fixes N/A

.github/workflows/test.js.yml

@@ -0,0 +1,23 @@
+name: karma-webpack CI
+
+on:
+  pull_request:
+    branches: [ next, master ]
+
+jobs:
+  test:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [10.x, 11.x, 12.x, 13.x, 14.x, 15.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 install
+      - run: npm test