ci: skip chromium download in jobs that do not need it

Author: yyx990803

.github/workflows/ci.yml

@@ -25,7 +25,7 @@ jobs:
           node-version: 18
           cache: 'pnpm'
 
-      - run: pnpm install
+      - run: PUPPETEER_SKIP_DOWNLOAD=1 pnpm install
 
       - name: Run unit tests
         run: pnpm run test-unit
@@ -69,7 +69,7 @@ jobs:
           node-version: 18
           cache: 'pnpm'
 
-      - run: pnpm install
+      - run: PUPPETEER_SKIP_DOWNLOAD=1 pnpm install
 
       - name: Run eslint
         run: pnpm run lint
@@ -96,7 +96,7 @@ jobs:
           node-version: 18
           cache: 'pnpm'
 
-      - run: pnpm install
+      - run: PUPPETEER_SKIP_DOWNLOAD=1 pnpm install
       - run: pnpm run size
 
       # - name: Check build size