Adds tests to the pipeline

.github/workflows/unit-tests.yml

@@ -0,0 +1,19 @@
+name: Unit tests
+on: push
+jobs:
+  container-job:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version: [14.x]
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v2
+      - name: Install dependencies
+        run: npm ci
+      - name: Spago install
+        run: npx spago -x test.dhall install
+      - name: Spago build
+        run: npx spago -x test.dhall build
+      - name: Spago test
+        run: npm t