Speed up CI by avoiding repeated npm install & build already done with "prepare" hook

.github/workflows/ci.yml

@@ -25,8 +25,7 @@ jobs:
       uses: actions/setup-node@v1
       with:
         node-version: ${{ matrix.node-version }}
-    - run: npm run dev-up
-    - run: npm run build
+    - run: npm install # will also, through `prepare` hook, 1. install ./app, and 2. build
       # Only run linter once, for faster CI. Align the verisons of Node here with above and publish.yml.
     - if: matrix.platform == 'ubuntu-latest' && matrix.node-version == '14.x'
       run: npm run lint

.github/workflows/publish.yml

@@ -14,9 +14,10 @@ jobs:
         # Align the version of Node here with ci.yml.
         node-version: '14.x'
         registry-url: 'https://registry.npmjs.org'
-    - run: npm run dev-up
-    - run: npm run build
+    # Will also (through `prepare` hook): 1. install ./app, and 2. build
+    - run: npm install
     - run: npm test
+    - run: npm run lint
     - run: npm publish
       env:
         NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}