fix(iaas): prevent replace in server_volume_attach, when migrating to iaas v2 (#1135)

Author: marceljk

stackit/internal/services/iaas/volumeattach/resource.go

@@ -205,6 +205,7 @@ func (r *volumeAttachResource) Create(ctx context.Context, req resource.CreateRe
 	}
 
 	model.Id = utils.BuildInternalTerraformId(projectId, region, serverId, volumeId)
+	model.Region = types.StringValue(region)
 
 	// Set state to fully populated data
 	diags = resp.State.Set(ctx, model)
@@ -248,6 +249,10 @@ func (r *volumeAttachResource) Read(ctx context.Context, req resource.ReadReques
 
 	ctx = core.LogResponse(ctx)
 
+	// Update region in model
+	model.Region = types.StringValue(region)
+	model.Id = utils.BuildInternalTerraformId(projectId, region, serverId, volumeId)
+
 	// Set refreshed state
 	diags = resp.State.Set(ctx, model)
 	resp.Diagnostics.Append(diags...)