CI: test with pathbase

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[Copilot]

Pull request overview

Adds support for running the ASP.NET Core sample apps (and corresponding UI tests) under a non-root PathBase, to validate DotVVM works correctly when hosted behind a base path.

Changes:

• Add optional DOTVVM_TEST_PATH_BASE handling in AspNetCoreLatest sample startup to enforce a mandatory base path during CI runs.
• Extend the UI test GitHub Action to accept a path-base input and pass it through to test scripts.
• Update the Linux UI test runner script to probe the app under the base path and rewrite seleniumconfig.json base URLs accordingly.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

File	Description
src/Samples/AspNetCoreLatest/Startup.cs	Adds middleware to apply/enforce a mandatory PathBase for CI path-base testing.
.github/workflows/main.yml	Introduces path-base as a UI test matrix dimension and passes it into the UI test action.
.github/uitest/uitest.sh	Updates sample readiness probing and selenium config base URL rewriting to include the optional path base.
.github/uitest/action.yml	Adds path-base input and exports it as DOTVVM_TEST_PATH_BASE for both bash and pwsh runs.

Comments suppressed due to low confidence (2)

.github/workflows/main.yml:204

• The matrix defines path-base, but this include entry doesn’t specify it. In GitHub Actions, included matrix rows can end up without the key, and ${{ matrix.path-base }} later may fail/resolve to null. Add path-base: "" to this and the other include entries that don’t override it.

        path-base: [""]
        include:
          - browser: chrome
            os: windows-2022
            environment: Development

.github/workflows/main.yml:215

• This include entry (and others below) doesn’t set path-base, but matrix.path-base is referenced later. Ensure every included row sets path-base (typically to "") so the matrix variable is always defined.

          - browser: firefox
            os: ubuntu-latest
            environment: Production
            samples-config: Default
          - browser: firefox

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