process needs to be disposed of (#252)

Author: SimonCropp

src/Microsoft.Tye.Core/ProcessUtil.cs

@@ -144,7 +144,8 @@ public static void KillProcess(int pid)
         {
             try
             {
-                Process.GetProcessById(pid)?.Kill();
+                using var process = Process.GetProcessById(pid);
+                process?.Kill();
             }
             catch (ArgumentException) { }
             catch (InvalidOperationException) { }

src/Microsoft.Tye.Hosting/ProcessRunner.cs

@@ -332,8 +332,8 @@ private void WriteReplicaToStore(string pid)
 
         private static string? GetDotnetRoot()
         {
-            var process = Process.GetCurrentProcess();
-            var entryPointFilePath = process.MainModule.FileName;
+            var entryPointFilePath = GetEntryPointFilePath();
+
             if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows) &&
                 Path.GetFileNameWithoutExtension(entryPointFilePath) == "dotnet")
             {
@@ -347,6 +347,12 @@ private void WriteReplicaToStore(string pid)
             return null;
         }
 
+        private static string GetEntryPointFilePath()
+        {
+            using var process = Process.GetCurrentProcess();
+            return process.MainModule.FileName;
+        }
+
         private class ProcessInfo
         {