ci(test): validate typescript, run lint only once

Author: gr2m

.github/workflows/test.yml

@@ -7,20 +7,37 @@ name: Test
     types:
       - opened
       - synchronize
+
 jobs:
-  test:
+  test_matrix:
     runs-on: ubuntu-latest
     strategy:
       matrix:
         node_version:
           - 10
           - 12
           - 14
+
     steps:
       - uses: actions/checkout@v2
-      - name: "Use Node.js ${{ matrix.node_version }}"
+      - name: Use Node.js \${{ matrix.node_version }}
         uses: actions/setup-node@v2
         with:
-          node-version: "${{ matrix.node_version }}"
+          node-version: \${{ matrix.node_version }}
+      - uses: actions/cache@v1
+        with:
+          path: ~/.npm
+          key: \${{ runner.os }}-node-\${{ hashFiles('**/package-lock.json') }}
+          restore-keys: |
+            \${{ runner.os }}-node-
+      - run: npm ci
+      - run: npm test --ignore-scripts # run lint only once
+
+  test:
+    runs-on: ubuntu-latest
+    needs: test_matrix
+    steps:
+      - uses: actions/checkout@v2
       - run: npm ci
-      - run: npm test
+      - run: npm lint
+      - run: npm run test:typescript