fix(CI): reorder demo build and release to prevent npm issue

.github/workflows/main.yml

@@ -30,7 +30,9 @@ jobs:
       - name: Test
         run: yarn lib:test:ci
       - name: Coverage
-        run: yarn codecov
+        uses: codecov/codecov-action@v1
+        with:
+          fail_ci_if_error: true # optional (default = false)
       - name: Build
         run: yarn lib:build:prod
       - name: Incremental code quality checking
@@ -39,15 +41,15 @@ jobs:
         run: rm dist/observable-webworker/README.md && cp README.md dist/observable-webworker
       - name: Copy LICENSE into dist
         run: cp LICENSE dist/observable-webworker
+      - name: Build Demo
+        if: contains('refs/heads/master', github.ref)
+        run: yarn run demo:build:prod --progress=false --base-href "https://cloudnc.github.io/observable-webworker/"
       - name: Release
         if: contains('refs/heads/master refs/heads/next', github.ref)
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
         run: npx semantic-release
-      - name: Build Demo
-        if: contains('refs/heads/master', github.ref)
-        run: yarn run demo:build:prod --progress=false --base-href "https://cloudnc.github.io/observable-webworker/"
       - name: Deploy
         if: contains('refs/heads/master', github.ref)
         uses: peaceiris/actions-gh-pages@v3