How to get ASP.NET Core 8 Blazor Web App (without index.html) to run hosted in GitHub Pages

[szalapski]

In an ASP.NET Core 7 Blazor WebAssembly app, I had everything working well hosting on GitHub Pages via Actions deploying with the help of JamesIves/github-pages-deploy-action@v4.

But after upgrading to ASP.NET Core 8 and converting it to a Blazor Web App, it uses a App.razor file in the server project instead of index.html in the client's wwwroot. Index.html is deleted.

I think GitHub Pages needs an index.html to work at all, right? How do I get my Blazor Web App to work in GitHub Pages without index.html? If I just try it the same way as in the Blazor WebAssembly app, I get the 404 page, and I assume that's because I have no index.html. Any suggestions?

Also posted: https://stackoverflow.com/questions/78134081/how-to-get-asp-net-core-8-blazor-web-app-without-index-html-to-run-hosted-in-g

Here's my Action jobs section:

jobs:
    deploy-to-github-pages:
    # use ubuntu-latest image to run steps on
    runs-on: ubuntu-latest
    steps:

    - uses: actions/checkout@v4

    - name: Setup .NET SDK
        uses: actions/setup-dotnet@v4
        with:
        dotnet-version: 8.0.x

    - name: Install .NET WASM Build Tools
        run: dotnet workload install wasm-tools

    - name: Publish .NET project
        run: dotnet publish Server/Sz.Blazor.Reveal.Server.csproj -c:Debug -p:GHPages=true -o dist/web --nologo

    - name: ls
        run: ls -alF dist/web/wwwroot

    # - name: Change base-tag in index.html from / so GH Pages can run it in a virtual subdirectory
    #   run: sed -i 's|<base href="/"|<base href="/Sz.Blazor.Reveal/"|g' dist/web/wwwroot/App.razor

    - name: Replaces gh-pages branch via JamesIves github-pages-deploy-action
        uses: JamesIves/github-pages-deploy-action@v4
        with:
        branch: gh-pages
        folder: dist/web/wwwroot
        token: ${{ secrets.ACCESS_TOKEN }}

    permissions:
        contents: write