fix: fix iconslug handling

main.go

@@ -23,6 +23,7 @@ var message string
 
 type templateData struct {
 	CardID    string
+	IconSlug  string
 	Title     string
 	SubTitle  string
 	Author    string
@@ -50,6 +51,13 @@ func main() {
 	}
 	data.Author = author
 
+	icon := githubactions.GetInput("iconslug")
+	if icon == "" {
+		githubactions.Infof("[INFO] Missing input 'iconslug', using default")
+		icon = "git"
+	}
+	data.IconSlug = icon
+
 	title := githubactions.GetInput("title")
 	if title == "" {
 		githubactions.Infof("[INFO] Missing input 'title', using default")
@@ -168,6 +176,11 @@ func card(d templateData) ([]byte, error) {
 
 	if d.IconUrl == "" {
 		d.IconUrl = "https://github.githubassets.com/images/modules/logos_page/Octocat.png"
+		d.IconUrl = fmt.Sprintf(
+			"https://cdn.simpleicons.org/%s/%s",
+			d.IconSlug,
+			d.Color,
+		)
 	}
 
 	if d.EventBody == "" {