Update GitHub actions

[mycroes]

No description provided.

[Copilot]

Pull Request Overview

This PR updates the GitHub Actions workflow for .NET projects.

• Removes the defaults block for run shell configuration.
• Adds a new Setup .NET step to support both .NET 6 and 7.
• Updates versions for GitVersion, artifact actions, and adjusts the operating system matrix.

Comments suppressed due to low confidence (4)

.github/workflows/dotnet.yml:40

• Confirm that pinning GitVersion to '6.0.x' instead of '6.x' aligns with your intended version compatibility requirements.

versionSpec: '6.0.x'

.github/workflows/dotnet.yml:74

• Double-check that replacing 'macos-latest' with 'macos-13' fully supports all dependent steps and test environments.

os: [windows-latest, ubuntu-latest, macos-13]

.github/workflows/dotnet.yml:33

• Ensure that the multi-line specification for multiple .NET versions is supported by actions/setup-dotnet@v3 and behaves as expected during the workflow execution.

dotnet-version: |
          6.x
          7.x

.github/workflows/dotnet.yml:100

• [nitpick] Verify that using a negated ACT environment variable as the condition for caching is logically sound and covers all your intended scenarios.

if: ${{ !env.ACT }}

[seilc1]

I think we had a similar issue in the recent past: the ports used are not that eagerly freed, so that if a fixed port is used, it can happen that it's still considered in use.

There are (atleast) two unreliable solutions:

1. increment the port each time -> increased potential to conflict with other applications
2. try to get a free port by using new TcpListener(IPAddress.Loopback, 0) -> can still be flaky in multi threading scenarios

what's the best way to provide you a fix suggestion?

[seilc1]

    [TestClass]
    public partial class S7NetTests : IDisposable
    {
        #region Constants
        const int DB2 = 2;
        const int DB4 = 4;
        const short TestServerPortStart = 31122;
        const string TestServerIp = "127.0.0.1";
        #endregion

        #region Private fields
        Plc plc;
        private readonly short testServerPort;
        #endregion

        private static readonly object _lock = new();
        private static short currentTestServerPort = TestServerPortStart;

        #region Constructor
        /// <summary>
        /// Create a plc that will connect to localhost (Snap 7 server) and connect to it
        /// </summary>
        public S7NetTests()
        {
            lock (_lock)
            {
                currentTestServerPort++;
                testServerPort = currentTestServerPort;
            }

            plc = CreatePlc(testServerPort);

        }

        private static Plc CreatePlc(short port)
        {
            return new Plc(CpuType.S7300, TestServerIp, port, 0, 2);
        }

        [TestInitialize]
        public void Setup()
        {
            S7TestServer.Start(testServerPort);
            plc.Open();
        }