fix: workaround podman bug wrt error reporting

In case that the image registry hostname is not resolvable podman now
return error in bad JSON shape so it's not decodable by client.

For now we assume that '500.*but provided no error-message' means
hostname resolution error.

Signed-off-by: Matej Vašek <matejvasek@gmail.com>

Author: matejvasek

pkg/docker/pusher.go

@@ -194,7 +194,8 @@ func (n *Pusher) pushImage(ctx context.Context, f fn.Function, credentials oci.C
 	errStr := err.Error()
 	if strings.Contains(errStr, "no such host") ||
 		strings.Contains(errStr, "failure in name resolution") ||
-		regexp.MustCompile(`lookup .*: server misbehaving`).MatchString(errStr) {
+		regexp.MustCompile(`lookup .*: server misbehaving`).MatchString(errStr) ||
+		regexp.MustCompile(`500.*but provided no error-message`).MatchString(errStr) {
 		// push with custom transport to be able to push into cluster private registries
 		return n.push(ctx, f, credentials, output)
 	}