mysql command replaced by mariadb

The command has been renamed from mysql to mariadb and it looks like the
symlink that has been in place for many versions has also been removed
in newer MariaDB versions.

Fixes #941

src/Testcontainers.MariaDb/MariaDbBuilder.cs

@@ -135,7 +135,7 @@ private sealed class WaitUntil : IWaitUntil
         /// <param name="configuration">The container configuration.</param>
         public WaitUntil(MariaDbConfiguration configuration)
         {
-            _command = new List<string> { "mysql", "--protocol=TCP", $"--port={MariaDbPort}", $"--user={configuration.Username}", $"--password={configuration.Password}", configuration.Database, "--wait", "--silent", "--execute=SELECT 1;" };
+            _command = new List<string> { "mariadb", "--protocol=TCP", $"--port={MariaDbPort}", $"--user={configuration.Username}", $"--password={configuration.Password}", configuration.Database, "--wait", "--silent", "--execute=SELECT 1;" };
         }
 
         /// <inheritdoc />

src/Testcontainers.MariaDb/MariaDbContainer.cs

@@ -45,7 +45,7 @@ public async Task<ExecResult> ExecScriptAsync(string scriptContent, Cancellation
         await CopyAsync(Encoding.Default.GetBytes(scriptContent), scriptFilePath, Unix.FileMode644, ct)
             .ConfigureAwait(false);
 
-        return await ExecAsync(new[] { "mysql", "--protocol=TCP", $"--port={MariaDbBuilder.MariaDbPort}", $"--user={_configuration.Username}", $"--password={_configuration.Password}", _configuration.Database, $"--execute=source {scriptFilePath};" }, ct)
+        return await ExecAsync(new[] { "mariadb", "--protocol=TCP", $"--port={MariaDbBuilder.MariaDbPort}", $"--user={_configuration.Username}", $"--password={_configuration.Password}", _configuration.Database, $"--execute=source {scriptFilePath};" }, ct)
             .ConfigureAwait(false);
     }
 }