Update CI config (#1397)

* separate lint step to a new job and run it only once
* add caching

.github/workflows/main.yml

@@ -1,6 +1,7 @@
 name: CI
 env:
   FORCE_COLOR: 2
+  NODE: 14
 on:
   push:
     branches:
@@ -9,6 +10,25 @@ on:
     branches:
       - master
 jobs:
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: actions/setup-node@v2
+        with:
+          node-version: ${{ env.NODE }}
+      - name: Set up npm cache
+        uses: actions/cache@v2
+        with:
+          path: |
+            ~/.npm
+            ~/.cache/ms-playwright
+          key: ${{ runner.os }}-node-${{ env.NODE }}-${{ hashFiles('package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-node-${{ env.NODE }}-${{ hashFiles('package-lock.json') }}
+      - run: npm ci
+      - run: npm run lint
   test:
     name: Node.js ${{ matrix.node-version }}
     runs-on: ubuntu-latest
@@ -25,7 +45,15 @@ jobs:
       - uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node-version }}
+      - name: Set up npm cache
+        uses: actions/cache@v2
+        with:
+          path: |
+            ~/.npm
+            ~/.cache/ms-playwright
+          key: ${{ runner.os }}-node-${{ matrix.node-version }}-${{ hashFiles('package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-node-${{ matrix.node-version }}-${{ hashFiles('package-lock.json') }}
       - run: npm ci
       - run: npm test
       - run: npm run test-browser
-      - run: npm run lint