refactor: 优化工作流文件

.github/workflows/build.yml

@@ -3,7 +3,7 @@ name: Build and deploy
 on:
   push:
     paths:
-      - ".github/**"
+      - ".github/workflows/**"
       - "src/**"
       - "theme/**"
       - "book.toml"
@@ -82,8 +82,7 @@ jobs:
           fc-cache -rv
       - name: Build
         run: |
-          sed -i "s/BUILD_TIME/$(TZ=Asia/Shanghai date -Isecond)/" src/about.md
-          sed -i "s/COMMIT_SHA/${{ github.sha }}/" src/about.md
+          sed -e "s/BUILD_TIME/$(TZ=Asia/Shanghai date -Isecond)/" -e "s/COMMIT_SHA/${{ github.sha }}/" -i src/about.md
           npm run build
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v3