Add separate jobs in GitHub Actions CI

Author: wojtekmaj

.github/workflows/ci.yml

@@ -10,8 +10,8 @@ on:
     branches: [ main ]
 
 jobs:
-  test:
-    name: Test
+  lint:
+    name: Static code analysis
     runs-on: ubuntu-latest
 
     steps:
@@ -27,4 +27,23 @@ jobs:
         run: yarn --immutable
 
       - name: Run tests
-        run: yarn test
+        run: yarn lint
+
+  unit:
+    name: Unit tests
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Use Node.js
+        uses: actions/setup-node@v2
+        with:
+          node-version: '16'
+
+      - name: Install dependencies
+        run: yarn --immutable
+
+      - name: Run tests
+        run: yarn jest