builder: skip name validation for docker context

Although a builder from the store cannot be created unless
it has a valid name, this is not the case for a Docker context.

We should skip name validation when checking a node from the
store and fall back to finding one from Docker context instead.

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

store/util.go

@@ -11,9 +11,28 @@ import (
 
 var namePattern = regexp.MustCompile(`^[a-zA-Z][a-zA-Z0-9\.\-_]*$`)
 
+type errInvalidName struct {
+	error
+}
+
+func (e *errInvalidName) Error() string {
+	return e.error.Error()
+}
+
+func (e *errInvalidName) Unwrap() error {
+	return e.error
+}
+
+func IsErrInvalidName(err error) bool {
+	_, ok := err.(*errInvalidName)
+	return ok
+}
+
 func ValidateName(s string) (string, error) {
 	if !namePattern.MatchString(s) {
-		return "", errors.Errorf("invalid name %s, name needs to start with a letter and may not contain symbols, except ._-", s)
+		return "", &errInvalidName{
+			errors.Errorf("invalid name %s, name needs to start with a letter and may not contain symbols, except ._-", s),
+		}
 	}
 	return strings.ToLower(s), nil
 }