Add yarn matrix (#295)

.github/workflows/pr-any.yml

@@ -2,54 +2,18 @@ name: PR
 on: [pull_request]
 
 jobs:
-  lint:
-    name: Linting
+  pr:
+    strategy:
+      matrix:
+        step: ['lint', 'test', 'build', 'docs']
+    name: ${{ matrix.step }}
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v1
     - uses: actions/setup-node@v1
       with:
         node-version: '12.x'
-    - name: lint
+    - name: ${{ matrix.step }}
       run: |
         yarn install --immutable | grep -v 'YN0013'
-        yarn lint
-
-  test:
-    name: Testing
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v1
-    - uses: actions/setup-node@v1
-      with:
-        node-version: '12.x'
-    - name: test
-      run: |
-        yarn install --immutable | grep -v 'YN0013'
-        yarn test
-
-  build_code:
-    name: Build Code
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v1
-    - uses: actions/setup-node@v1
-      with:
-        node-version: '12.x'
-    - name: build
-      run: |
-        yarn install --immutable | grep -v 'YN0013'
-        yarn build
-
-  build_docs:
-    name: Build Docs
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v1
-    - uses: actions/setup-node@v1
-      with:
-        node-version: '12.x'
-    - name: build
-      run: |
-        yarn install --immutable | grep -v 'YN0013'
-        yarn docs
+        yarn ${{ matrix.step }}