ci: setup github actions

build and run tests on ci

.github/workflows/ci.yml

@@ -0,0 +1,22 @@
+name: Build & Test CI
+
+on:
+    push:
+        branches:
+            - master
+    pull_request:
+        branches:
+            - master
+
+jobs:
+    builds:
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v2
+
+            - name: Install dependencies
+              run: yarn
+            - name: Build packages
+              run: yarn build
+            - name: Automated tests
+              run: yarn test