Alpha (#4)

* chore: initial push to be able to work together

* chore: add missing wait folder

* chore: add missing folders

* chore: cleanup alpha branch

* feat: mssql alpha instance (#2)

* fix: remove unused attribute types and functions from backup models

* fix: update API client references to use sqlserverflexalpha package

* fix: update package references to use sqlserverflexalpha and modify user data source model

* fix: add sqlserverflexalpha user data source to provider

* fix: add sqlserverflexalpha user resource and update related functionality

* chore: add stackit_sqlserverflexalpha_user resource and instance_id variable

* fix: refactor sqlserverflexalpha user resource and enhance schema with status and default_database

---------

Co-authored-by: Andre Harms <andre.harms@stackit.cloud>
Co-authored-by: Marcel S. Henselin <marcel.henselin@stackit.cloud>

* feat: add sqlserver instance

* chore: fixing tests

* chore: update docs

---------

Co-authored-by: Marcel S. Henselin <marcel.henselin@stackit.cloud>
Co-authored-by: Andre Harms <andre.harms@stackit.cloud>

stackit/internal/utils/headers_test.go

@@ -0,0 +1,48 @@
+// Copyright (c) STACKIT
+
+package utils
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/stackitcloud/stackit-sdk-go/core/config"
+)
+
+func TestUserAgentConfigOption(t *testing.T) {
+	type args struct {
+		providerVersion string
+	}
+	tests := []struct {
+		name string
+		args args
+		want config.ConfigurationOption
+	}{
+		{
+			name: "TestUserAgentConfigOption",
+			args: args{
+				providerVersion: "1.0.0",
+			},
+			want: config.WithUserAgent("stackit-terraform-provider/1.0.0"),
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			clientConfigActual := config.Configuration{}
+			err := tt.want(&clientConfigActual)
+			if err != nil {
+				t.Errorf("error applying configuration: %v", err)
+			}
+
+			clientConfigExpected := config.Configuration{}
+			err = UserAgentConfigOption(tt.args.providerVersion)(&clientConfigExpected)
+			if err != nil {
+				t.Errorf("error applying configuration: %v", err)
+			}
+
+			if !reflect.DeepEqual(clientConfigActual, clientConfigExpected) {
+				t.Errorf("UserAgentConfigOption() = %v, want %v", clientConfigActual, clientConfigExpected)
+			}
+		})
+	}
+}