Simplify github action config

Author: marvinhagemeister

.github/workflows/ci.yml

@@ -14,18 +14,25 @@ jobs:
       - uses: actions/setup-node@v1
         with:
           node-version: '12.x'
-      - name: npm install, build, and test
-        run: npm ci
-      - name: build
-        run: npm run prepare
+      - name: Cache node modules
+        uses: actions/cache@v1
         env:
-          CI: true
+          cache-name: cache-node-modules
+        with:
+          path: ~/.npm
+          # This uses the same name as the build-action so we can share the caches.
+          key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            ${{ runner.os }}-build-${{ env.cache-name }}-
+            ${{ runner.os }}-build-
+            ${{ runner.os }}-
+      - run: npm ci
       - name: build
-        run: npm test
-        env:
-          CI: true
-      - name: saucelabs
-        run: npm run test:browser
+        run: npm run prepare
+      - name: test
+        run: |
+          npm run lint
+          npm run test:browsers
         env:
           CI: true
           SAUCE_USERNAME: ${{ secrets.SAUCE_USERNAME }}