ci(workflow): add 'npm' cache for actions/setup-node in .github/workflows (#157)

Author: oscard0m

.github/workflows/release.yml

@@ -16,6 +16,7 @@ jobs:
       - uses: actions/setup-node@v2
         with:
           node-version: "12.x"
+          cache: npm
       - run: npm ci
       - run: npm run build
       - run: npx semantic-release

.github/workflows/test.yml

@@ -23,5 +23,6 @@ jobs:
         uses: actions/setup-node@v2
         with:
           node-version: "${{ matrix.node_version }}"
+          cache: npm
       - run: npm ci
       - run: npm test