Setup NodeJS 12 on CI

.github/workflows/test.yml

@@ -1,14 +1,18 @@
-name: CI Tests
+name: Main
 
 on: [pull_request, push]
 
 jobs:
-  lint:
-    name: Quick tests
+  tests:
+    name: Tests
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v1
-    - name: Bootstrap
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v1
+        with:
+          node-version: "12.x"
+          registry-url: "https://registry.npmjs.org"
+      - name: Install deps
         run: yarn
       - name: Check types
         run: yarn check-types