fix(migration): convert trello card descriptions from markdown to html

pkg/modules/migration/trello/trello.go

@@ -17,6 +17,8 @@
 package trello
 
 import (
+	"bytes"
+
 	"code.vikunja.io/api/pkg/config"
 	"code.vikunja.io/api/pkg/files"
 	"code.vikunja.io/api/pkg/log"
@@ -24,6 +26,7 @@ import (
 	"code.vikunja.io/api/pkg/modules/migration"
 	"code.vikunja.io/api/pkg/user"
 	"github.com/adlio/trello"
+	"github.com/yuin/goldmark"
 )
 
 // Migration represents the trello migration struct
@@ -160,6 +163,16 @@ func getTrelloData(token string) (trelloData []*trello.Board, err error) {
 	return
 }
 
+func convertMarkdownToHTML(input string) (output string, err error) {
+	var buf bytes.Buffer
+	err = goldmark.Convert([]byte(input), &buf)
+	if err != nil {
+		return
+	}
+	//#nosec - we are not responsible to escape this as we don't know the context where it is used
+	return buf.String(), nil
+}
+
 // Converts all previously obtained data from trello into the vikunja format.
 // `trelloData` should contain all boards with their projects and cards respectively.
 func convertTrelloDataToVikunja(trelloData []*trello.Board, token string) (fullVikunjaHierachie []*models.ProjectWithTasksAndBuckets, err error) {
@@ -220,11 +233,15 @@ func convertTrelloDataToVikunja(trelloData []*trello.Board, token string) (fullV
 				// The usual stuff: Title, description, position, bucket id
 				task := &models.Task{
 					Title:          card.Name,
-					Description:    card.Desc,
 					KanbanPosition: card.Pos,
 					BucketID:       bucketID,
 				}
 
+				task.Description, err = convertMarkdownToHTML(card.Desc)
+				if err != nil {
+					return nil, err
+				}
+
 				if card.Due != nil {
 					task.DueDate = *card.Due
 				}

pkg/modules/migration/trello/trello_test.go

@@ -52,7 +52,7 @@ func TestConvertTrelloToVikunja(t *testing.T) {
 					Cards: []*trello.Card{
 						{
 							Name: "Test Card 1",
-							Desc: "Card Description",
+							Desc: "Card Description **bold**",
 							Pos:  123,
 							Due:  &time1,
 							Labels: []*trello.Label{
@@ -218,7 +218,7 @@ func TestConvertTrelloToVikunja(t *testing.T) {
 				{
 					Task: models.Task{
 						Title:          "Test Card 1",
-						Description:    "Card Description",
+						Description:    "<p>Card Description <strong>bold</strong></p>\n",
 						BucketID:       1,
 						KanbanPosition: 123,
 						DueDate:        time1,