Merge pull request #13 from actions/ci-on-pr

Update workflow to build and test pull requests

.github/workflows/workflow.yml

@@ -1,5 +1,13 @@
-name: Main workflow
-on: [push]
+name: build-test
+on:
+  push:
+    branches:
+      - master
+    paths-ignore:
+      - '**.md'
+  pull_request:
+    paths-ignore:
+      - '**.md'
 jobs:
   run:
     name: Run
@@ -9,12 +17,12 @@ jobs:
         operating-system: [ubuntu-latest, windows-latest]
     steps:
     - name: Checkout
-      uses: actions/checkout@master
+      uses: actions/checkout@v2
 
-    - name: Set Node.js 10.x
-      uses: actions/setup-node@master
+    - name: Set Node.js 12
+      uses: actions/setup-node@v1
       with:
-        node-version: 10.x
+        node-version: 12
 
     - name: npm install
       run: npm install