Add GitHub Actions & Upgrade to .NET 8

[JosefDvorak]

Motivation

The purpose of this PR is to add a minimum viable replacement for AppVeyor Build test using GitHub Actions Workflow

As part of the implementation, several issues were encountered that had to be addressed.

• The .NET Core 2.2 compatibility with Actions Workflow
  • Resolved by upgrade to .NET 8
• Packages with bugs when used in .NET 8
  • Resolved by upgrading:
    • Autofac
    • SqlClient
• JSON serialization behaviour has changed.
  • Resolved by implementing missing converters.

Checklist

• Code follows coding conventions held in this repo
• Automated tests have been added
• Tests are passing
• Docs have been updated (if applicable)
• Temporary settings (e.g. variables used during development and testing) have been reverted to defaults

How to test

Verify that project builds, reports execute and conduct code review.

For your reference, the GitHub Action Workflow has been tested on a mirror pull request on forked repository:

JosefDvorak#3

[kentico-ericd]

@JosefDvorak Not sure if you got this too, but I got this error when trying to run an action:

System.InvalidOperationException: Synchronous operations are disallowed. Call ReadAsync or set AllowSynchronousIO to true instead.

So I made a few changes in 268dfaf to resolve that, then a few other changes suggested by code analysis.

Otherwise, it's all working and looks good 👍 Do we want to implement the automatic build+upload process as in https://github.com/kentico-ericd/KInspector/blob/master/.github/workflows/dotnet-desktop.yml?

[JosefDvorak]

Thanks for catching that issue.

Yes, implementing build is the next step, but I wanted to make sure the PR is as small as possible. So that will be for the next one, after this one is reviewed by you. I've tested the commits you made, and everything works fine, so I think we're ready to merge, if you approve.

It looks like you already have most of the build script. Will you be able to update it for .NET 8 and make a PR, or would you like me to take that over?