Add curl package for Gitea Alpine Package Registry upload

- Install curl package in Alpine build workflow
- Ensure curl is available for package upload step
- Prepare for package registry upload with authentication

.github/workflows/build-alpine.yml

@@ -82,6 +82,7 @@ jobs:
       - name: Upload to Gitea Alpine Package Registry
         if: github.event_name == 'push' && github.ref == 'refs/heads/master'
         run: |
+          apk add --no-cache curl
           curl --user "eric:df299a6e592a8bd829d018b7816e76d03756408d" \
                --upload-file alpine_build/cpu-check-${{ env.PKG_VERSION }}-r${{ env.PKG_RELEASE }}.apk \
                "https://git.ericxliu.me/api/packages/eric/alpine/v3.17/main"