feat: get image blob in backend (#495)

* feat: get image blob in backend

* chore: update

plugin/http_getter/image_test.go

@@ -0,0 +1,21 @@
+package getter
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestGetImage(t *testing.T) {
+	tests := []struct {
+		urlStr string
+	}{
+		{
+			urlStr: "https://star-history.com/bytebase.webp",
+		},
+	}
+	for _, test := range tests {
+		_, err := GetImage(test.urlStr)
+		require.NoError(t, err)
+	}
+}